JPEG quality

JPEG is not just a file format for storing images, but a complex method for encoding and decoding images that has many settings.

About JPEG

About JPEG

Modern advanced digital cameras have several basic JPEG settings:

  1. JPEG image quality
  2. JPEG image size
  3. Adjust snapshot settings

Image quality is understood as the amount of useful data that JPEG can save. The JPEG format was developed for compact storage of images, it is based on methods and algorithms for compressing and optimizing images. JPEG coding algorithms are damn complex and sophisticated, but the basis is the level of compression on which the final image quality depends. Unlike BMP, TIFF and similar formats, JPEG does not store data about each individual pixel in the image, but only vector color shifts. By and large, this is a brilliant mathematical abstraction of the image, in which the only really encoded pixel is the upper left pixel. I will not delve into the essence of compression, I will focus only on the fact that it is the compression level in JPEG format that affects the quality of a JPEG image.

For example, in the camera Nikon D40 3 levels of quality of a picture of JPEG can be set

  • High quality - Fine
  • Standard quality - Norm
  • Basic quality - Basic

In general, Fine mode implies saving the image in JPEG format with 100% preservation of details. But due to the specifics of the algorithm, 100% are conditional. Norm mode has a compression level twice that of Fine mode. And Basic mode compresses photos 4 times stronger than Fine mode. Thus, we get image files with less volume and with less useful data. The compression level is easy to track by the maximum file size for different JPEG compression levels. So, for Nikon D40:

  • Fine - 3,4MB
  • Norm - 1,8MB
  • Basic - 0,9MB

The most interesting thing is that the volume of files that the camera shows in the menu settings is the maximum estimated volume at a given encoding. Due to the features of the algorithm, for example, when shooting with Fine quality, it is unlikely that it will be possible to get a file with 3.4 MB, usually the algorithm does better and creates smaller files. JPEG file size depends on what is in the image. Roughly speaking, the algorithm encodes a snapshot with a uniformly blue sky at minimal cost, and as a result we get about 3.4 MB instead of 1 MB. But if you shoot at night at high ISO, you can get a file about 3MB in size. This is due to the fact that at high ISO values ​​there will be a lot of digital noise, that is, there will be many heterogeneous pixels in the photo, for which it is difficult to choose interpolation (averaging) and the JPEG algorithm needs to use more memory to save all the details in the picture.

Attention: due to the fact that the camera calculates the number of remaining frames on the card precisely by the maximum allowable volume of the image, their actual number is much larger. For example, I use a 16GB memory card on Nikon D40. At the same time, in different modes, the camera shows:

  • Fine - 4400 photos
  • Norm - 8400 photos
  • Basic - 16.400 photos

But in fact, in Fine mode, over 6000 photos are easily placed.

Here is an example of a drop in photo quality when using software processing of the same image with different compression levels.

Quality is 100%. File size 308 kb

100% quality

100% quality

Quality is 70%. File size 107 kb

70% quality

70% quality

Quality is 40%. File size 89,4 kb

40% quality

40% quality

Quality is 1%. File size 60,5 kb

1% quality

1% quality

In general, the same thing happens with different quality settings. Very often it’s very difficult to feel the difference between the various settings for camera JPEG, because the camera and marketers always try to amuse us with good photos. But the difference in file size is often very noticeable.

Also, most modern digital cameras have image size adjustment. This setting shows how many megapixels the picture will have. For example, Nikon D40:

  • Large, L (large) - 6.0MP, 3008X2000 dots
  • Medium, M (medium) - 3.3MP, 2256X1496 pixels
  • Small, S (small) - 1.5MP, 1504X1000 dots

This setting allows you to save files not only in the original size, which is the largest, but also files with fewer dots (pixels). This setting is important to save space. Very often, images can carry redundant information. Redundant information is pixels that do not carry useful information. For example, such pixels are digital noise, they appear due to poor-quality optics. With a smaller format, you don't have to lose anything.

All the same applies not only Nikon D40which I used as an example, but the rest of the digital cameras.

Important Note: when we use the large (maximum) size of a JPEG image, all information from the entire matrix of the camera is encoded. When we use a smaller image size, the camera itself still takes a picture using the entire matrix, that is, using all available pixels. Only after that the snapshot is reduced programmatically to the specified value. This is due to the standard cycle of the ADC camera. Do not think that if you shoot in a small image size, only individual pixels on the camera will work, and at the same time you can get an increase in the diffraction threshold or save battery power.

Important Note: almost always possible combine image quality and size. Thus, you can select any quality options for the final image. Also, all sorts of manipulations with the size and quality of JPEG are very strong affect frame buffer capabilities modern cameras. The smaller the size and the lower the quality, the more photos can fit into frame buffer with burst shooting. For example, JPEG L, Fine Nikon D40 can only put 7 shots, and M, Norm as much as 17. Actually, for the sake of manipulating the buffer, I started this article.

Algorithms that compress from size L to M or S are very complex and there are a lot of them. For example, a snapshot can be reduced on a computer, for this the program handler can use such size reduction algorithms: LancZos3, Bell, Bicubic, Bilinear, BSplite, FastLinear, LancZos2, Linear, Mitchell, Nearest, Triangle and a bunch of others. Using the JPEG format, from a pure photograph we get into the abstract mathematical field of matrices, vectors and the mind of incomprehensible subtleties.

720X479. File weighs 193 kb

720

720X479

640X426. The file weighs 159 kb

640X426

640X426

320X213. The file weighs 51,2 kb

640X426

320X213

160X106. The file weighs 24,1kb

640X426

640X426

Very often, huge image sizes, for example, 30-megapixel images on mobile phones, take up a huge volume, and the full potential of 30-megapixels is simply not used. Therefore, you can safely set a smaller image size. On my own I would add that for convenient viewing of photos even on the most expensive monitors with a 2560 × 1600 matrix, about a 4 megapixel picture is enough, and for printing in a 10X15 format, only about 1 megapixel is needed. Remember the last time you printed a photo, or enlarged a photo on a computer? From personal experience I will say that a huge number of pixels of modern cameras are needed only for serious photography. I see no need for ordinary household tasks chasing the number of megapixels, and in a camera with a large number of them, you can reduce the size of the output image without a serious loss in quality.

Some modern cameras have some advanced JPEG settings. For example, advanced Nikon cameras such as Nikon D700, D800 have JPEG quality / size priority setting. This setting allows you to tell the algorithm what is most important in image processing - file size or quality.

Important: for the best image quality, I still recommend using the largest image size with the best quality. For example, for Nikon cameras it is L, Fine, quality priority. But only the RAW format can realize the full potential and accuracy of image transfer from the matrix to the memory card. But even RAW files in some cameras go through a special 'compression' to reduce their size, you need to be extremely careful here.

Conclusions:

The JPEG format is a very interesting methodology for saving graphic files. I advise you to experiment with different image quality and size on your cameras, very often you can seriously save space by getting good results in photos.

Do not forget to press the buttons social networks ↓ - it is important for me. Thanks for attention. Arkady Shapoval.

Add a comment: KalekseyG

 

 

Comments: 100, on the topic: JPEG quality

  • Alexey N.

    Thanks! Now I know why the frame counter is lying :)
    > donut - read it again)!

  • Alexander

    This article accurately and clearly displays information about the Jpeg format, I think you can't put it better! There are no meanings and conclusions here, there is just everything about the Jpeg format! A very good article for those who still do not fully understand what the Jpeg format is….

  • Gene jb

    I don't understand why he even needs this JPEG in a DSLR. With a more or less serious occupation with photography, no one will shoot in JPEG, because it is normal and cannot be processed. I usually shoot in JPEG only when there is no way to process the image in a RAW converter, but I need to send it right away. Anyway, JPEG is a flawed format created only to provide fast loading on the Internet and a small amount when copying. The same applies to mp3 in music and DivX (mpeg4) in video. In addition, many hardware codecs (such as in cameras) are not well optimized, and for example in Photoshop you can get much better JPEG quality than a camera does. On the other hand, CHDK was originally developed with one goal in mind - to get RAW, that says something.

    • Artem

      In the case of d40, it’s convenient to get jpeg right after shooting without the need for editing. The result looks normal even for base compression, which is used when saving raw + jpeg. Perhaps Ken Rockwell, known to you, writes that he uses mostly base-quality jpeg only.

    • Konstantin

      Gene jb
      And you shoot immediately well and no processing is needed. The overwhelming majority of people holding digital SLR cameras are amateurs, not professional photographers. And this majority not only does not want to process photos by turning them into pictures, and in fact they do not need it. Think back to the era of film. There were, of course, methods of "processing", but after all, professional photographers somehow managed without processing programs. And their work was more professional.

      • Gene jb

        The fact is that EVEN taking pictures well in a jeep, you should always strive to have a good quality original photo. Maybe you will want to process it in 10 years or display it on a SuperMegaHD TV. It's like working with sound - it's better to have a 32/196 bit source than a 16/44 bit original.

      • teis

        Processing, this is not always turning the photograph into a picture. Often it is necessary to lighten sharp shadows a little or soften a harsh light, because it is not always necessary to shoot in ideal conditions. Strongly shaded and overexposed areas can be pulled out of the ditch with virtually no loss of quality, unlike jpeg.

      • Anton B.

        Support.
        For the seventh year, I do without exorbitant 40 MP and only jpeg. Only today all 10 photos were cut again when registering works at an international competition - they only accept 3000 pixels or more along the long side of the frame. And I have… 6 MP camera - just 2400+.
        Therefore, I will take the Nikon D7000 or - 5100 body. Lenses (three) are from Kiev-20 (they have an H mount). Glasses are no worse than Nikon's whales and 200-650-bucks. Most likely, I'll take the D5100, because I don’t draw money - I earn in the sweat of my brow. Taking this opportunity, I ask experienced owners: D5100 - “workhorse” (service is very far away!)? And further. On the forums, and even Radozhiva casually said that the D7000 specifically works better with the Kiev (Arsenal) optics. This is holding back my choice.

    • Alexander

      Here you are wrong! Jpeg is not a flawed format, but very convenient in many cases! Most people have no idea about RAW and many, no matter how you explain it, cannot understand the meaning of this RAW itself ...! RAW is needed only for advanced amateurs and professionals. Ordinary people who only know how to press the shutter button do not need it for nothing. I always shoot in RAW + Jpeg ... I need RAW for serious processing, Jpeg for quick viewing, display and quick editing for the Internet. The quality of Jpeg depends on who, how you set it in the camera settings ... And then all photo labs are printed mainly in Jpeg! So Jpeg is the right format in every way! And it is extremely inconvenient to convert from RAW after each shooting, so that you can view and select the necessary photos. It all takes a lot of time, while you can work with Jpeg immediately after copying to your computer, and not do the same, wasting extra time on it ... what a camera could do while shooting!

      • Oleksandr

        I’ll say more, I’m saying that I’m indivisible, I can change the technology of the D7 / 5D navigation and I’m able to see the RAV and I’m talking about the models of the new Rivny on the D800. So scho marketing і particularities virobnik takozha vrahovuє.

      • Andrey Super

        You lagged behind from life tovarisch!))) Go to the Nikon website and download small files to view the RAV and you will be happy!)))

    • Boris

      Your remark betrays your ignorance with your head! A million times I said to beginners: well, you don't know, ask, learn and finally wipe your bib !! JPG is not processed because YOU can't! Well, what a habit - to scold an egg for breaking ??? And who could not hold it in his hands? Or consider yourself a genius? Smarter than all development scientists? Maybe enough to be capricious, child, get busy with education!

      • Gene jb

        JPEG is a format based on the loss of a part of images that our eyesight does not see or does not see well. But this is only in the original. As soon as you begin to twist the brightness, contrast, color, everything invisible climbs into the visible. And no matter how you spit and beat the eggs, you won't really edit it, only within the limits of what the compression depth will give you.

    • Oleksandr

      JPEG is not just a format for capturing graphical bitmap images. A chain of direct scientific advances on a light scale, which is such a locomotive that is more challenging on its own advanced techniques and technology for processing digital signals. Take the new version of the JPEG2000 standard. The very developers of youmu in the applied sciences of science have become widely used for discrete wavelet transformations (DWT). The very experts of the JPEG method in the background of the world will be amused by the statistical overworld of the image. You can talk about the overwhelming and positive aspects of JPEG, but only those who can use the miraculous format of saving digital photographs because of the super-repulsive and broad possibilities.

      • Andrey Super

        I don’t understand who you are writing to? Talking to yourself? The site is Russian-speaking, the users are almost entirely Russian-speaking ... You can write in Chinese too, but who will translate and read it ... I have nothing against the Ukrainian language, but your actions are meaningless ...

        • Denis

          4 years have passed!

          • Andrey Super

            For the future…)))

            • Oleg

              I like this

        • Artem

          Your problems! This is a Ukrainian site and the Ukrainian language is normal here!

          • Andrey Super

            This is your problem, I have no problem.
            This is normal, only almost no one reads this, but here they are discussing ...

            • Oleg

              Of course it’s stupid to enter into a discussion with you, but you’re a rude friend. Which is Andrew super

              • Andrey Super

                “Of course it is stupid to enter into a discussion with you, but you are rude my friend. Which Andrew is super "
                Well, what kind of discussion can be with you, it’s hamlo and it’s hamlo in Africa ..

              • Oleg

                Yes, what to discuss with him then? A man slows down for 4 years! In 2021, he will understand that he was wrong.

            • Artem

              "This is normal, only almost nobody reads this, but here they are discussing ..."
              why do you speak for the rest? do not understand - google translator or skip it.

              • Andrey Super

                The translator translates inaccurately, to put it mildly, if I strain, I can read almost everything, but some specific abbreviations (I do not mean in English) are a disaster. Here people often ask something and how do they expect help if they write in languages ​​other than those accepted on this site?
                I am out of good intentions, and you into a fight, you evil ...

              • Denis

                Andrey Super, a lie, Google cannot translate badly, because the task is trivial.
                A person writes that JPEG is a locomotive that carries all of science. He is just in love with JPEG and there is nothing better in the world, nothing more perfect than JPEG

          • Andrey Super

            一般 认为 , 服务器 想 讨论… 多元 主义 , 但是…
            :-)

          • Lynx

            Not at all

        • Sergei . not super.,

          Would you like Andrew Super to add the word GOD to your name? If you know for everyone who reads what and what format is needed and which is not. Divine YOU are ours.

  • Ivan

    I agree with Alexander. Here everyone needs what and for what purpose to shoot. Jeepeg is enough for many, promptly and normally.

    But if someone is working to get masterpieces, then RAV is better here, there is more color depth, and white balance without loss of quality, and much more, and most importantly, saving all these settings as a separate file, which does not affect on the source.

    It is important to remember that no matter what a good final shot the camera gives out, a person can refine it and make it even better. The author’s idea is more evident here, since the camera does not know how to read thoughts, and cannot perfectly do everything as you would like, no matter how cool the automation is.

    If you are used to squeezing the maximum out of each pixel, then it is better to do this in RAV. If efficiency is more important to you, then Jeep is enough.

  • Jury

    And I shoot in two formats at once - RAW and JPEG. Then I save to the screw all the jpegs and only RAW of those images that are really very successful or clearly in need of processing.

    • Vadim

      Hmmm
      I'm somehow the other way around.

      RAW stored as digital negatives. And, frankly, I always thought that this is the main purpose of the format. Like old films shot a long time ago with a one-button soap box, which are carefully folded for someone curious from subsequent generations.
      Over time, RAW converters, the feeling of harmonious combinations of colors and exposure, the means of image output may change, but there are always sources at hand that will allow you to fix a lot if it occurs to me or someone else.

      But in .jpeg I export what is selected for display to relatives, friends, transmission via social media. networks and e-mail, sending to print, etc. At the same time, from one digital negative, you can produce a lot of .jpegs corresponding to any tasks in a couple of clicks. Fortunately, modern RAW converters are very friendly in this regard.

      • Jury

        Vadim, the newer the DSLR, the more megapixels and, accordingly, the size of the RAW file. That is why I keep only standing frames that have a chance to be edited sooner or later. But there are a bunch of other photos that do not pretend to any kind of artistry! This is just a display of information about the places where I was or about the events that I managed to see and capture. When shooting them, I chose the correct exposure, and the pictures do not have much value for me, but I did not want to lose them. In such cases, I do not save RAW In order to save disk space.

        • Vadim

          Well, I don’t think a 1-2 TB screw is a luxury, given the cost of DSLRs / lenses, so there’s especially nothing to save.

          But, of course, what I wrote is my personal opinion, which does not claim to be true. As in everything, the main thing is that people understand why and for what purpose they do what they do. And this blog allows you to hear different opinions in order to make informed decisions.

  • Alexander

    Ivan - Golden words!

  • Oleksandr

    Good evening. I just ask again, but what about a 30 megapixel mobile phone ??? Arkady mabut there mechanical inaccuracy crept in ...

  • Anatoly

    Arkady again quietly drove into the sore spot of photo-docs, megapixels. And then it went and went, wise men of saliva began to choke upon seeing the quality of photography only in insane MP.
    It’s hard for Khvotograkh, consciously addicted to 24 Mp, to imagine that they, irresponsible Mp, do not need him and Nafik, and also create a lot of inconvenience.
    Glory to the marketers !!!))))))))

    • Oleksandr

      Clever and photocamera, as if viralis, not in the head megapixels, but for someone who has buvovshy and dear apartment in low-key / com / friend. I photo tse takozh stosuєut;)))))

      • Oleg

        Ha ha ha A popular saying: the longer the lens, the cooler the photographer! But the length of the lens is not proportional to the artistic value of the photos;)

  • Valery

    Good judgments about ji-peg and rav, thanks for the discussion, each amateur photographer takes pictures as he likes. And HERE I UNDERSTAND THE PHOTO AMATEURS AND IF WHO WANTS TO PRINT THE PICTURES IN THE SIZE OF THE NEWSPAPER AND IT'S EXCELLENT FOR YOU. .

  • Dd

    Arkady,

    ... has a compression level twice that for Fine mode. Instead of “FOR” it is more desirable “WHAT” (in Russian), and from Ukrainian, it would be absolutely wrong))

    ... And the Basic mode squeezes ... - probably "squeezes"

    With respect.

    PS Could work as your corrector))

    • Vadim

      Yes, yes, this “for” also hurts me every time :)

    • Arkady Shapoval

      If you want to work as a proofreader, please. Send your edits to me by e-mail, I will be grateful.

    • Alexander

      Well, what do you cling to the words? Understand the meaning of what is written!

      • Vadim

        We respect the author with great respect and want the annoying minor errors / typos not to distract from the meaning of what was written. Everything exclusively for the development of a wonderful project

        • Vyacheslav

          I fully support Vadim! The author does a very good thing, and he does it well, and you should not find fault with clerical errors! The main idea!

  • PPS

    You have good articles, like everything is written in an accessible language, however, for me a lot is already too late, tk. I've reached a lot myself, or learned it somewhere else, but for beginners your resource is just a storehouse of valuable information!

    • Little Cossack Bernstein

      I agree! It is necessary to write, especially to those who have something to say. And not only young people, but also the elderly.
      I will notice, and I will note not without pepper: only beginners, laymen, and so on, go to such, purely artisan, sites (writing, computer, photographic and photo related, for example, photoshop, photo clubs, videos, homemade products, restoration, etc.) occasionally, individual apprentices. Hence the kilometer-long forums ABOUT ANYTHING. It would have been different, it was clear and intelligible: the inexperienced asked a question - the master answered clearly. That's about Rav-Jepeg ... Well, what did anyone find out, clarified? And one sensible one would say that comprehension of shooting in “jpeg” and in “rav” is only the initial step ... Until the threshold, before entering the Land of Light Painting - years of daily study and practice.

  • Oleg

    But I don’t see any reason for myself to shoot in raw (although, for professionals filming weddings, etc. there probably is some sense).
    1. To normally edit images (except cropping) you need a calibrated professional monitor.
    2. To view the pictures, again, you need the right monitor, or to print, you need a high-quality photo lab (not all of them are), or a calibrated printer.
    3. You must still be able to edit, know the program, feel the color, etc.
    Do you think everyone has it? If not, then what's the point of raw? Pontus one. And in my Sony’s DSLR, before clicking on the shutter button, I see what I’ll get (unlike all the others with their JVI), so I have practically no errors in exposure, white balance, etc., so I really have nothing to edit and pull out.

    • Alexander

      You do not go into such a jungle ....! What does a calibrated monitor mean? For advanced photography, you just need a monitor with a good matrix! You look at the photos of professionals in glossy magazines, and something does not come to mind of a professional camera and a calibrated monitor! Previously, when there was film, without computers and Photoshop, excellent photos were taken, but now the line is more visible in all this - "How to get more money from photographers", and not really necessary and useful devices to sell them! Edit the photo on your computer and print it in a good photo lab, if the images look the same on your monitor and in the photo, then you have a good monitor and graphics card! If not, then the monitor is cheap and of poor quality! That's the whole calibration! And buy a calibrator - just throw your money down the drain and still don't set anything up, because it's just a scam for money ....

      • Oleg

        >>… if the images look the same on your monitor and in the photo, then you have a good monitor and graphics card! If not, then the monitor is cheap and of poor quality! ...

        They just won’t look the same. To edit photos you need a high-quality and expensive monitor, at the cost of a carcass SLR! Editing colors on a regular monitor, in my opinion, is completely pointless.

        • Gray

          in my opinion, nonsense) who prints photos in magazines, he buys such monics) because there are decent fees, but they are bought for pontoons. We and the client are simpler and monica correspond) but from personal, I worked on my eyser for $ 400 and Samsung for $ 1100 and on a print difference of $ 700 and does not smell

          • Alexander

            Yes, all these squats on the ears, that only on an expensive monitor you can edit something, nothing more than an unobtrusive push to buy expensive monitors, which in many cases is an unjustified waste of money! I also have an Acer 1951 for 400 bucks and the photo on his screen does not differ from the photo printed on paper in a good photo lab ... For example, I live in Norilsk, and I print photos on vacation, in the city of Krivoy Rog, in the ProCenter photo lab, because not a single photo lab in Norilsk and Belgorod, where I visit on the way to Ukraine when I go on vacation, does not print normally, but in Krivoy Rog ProCenter prints very high quality, I can say that all the pros from this city print only there ... Meaning here is that the monitor would display colors correctly (and not, for example, cooler or warmer!). When buying a monitor, you just need to check the correctness of the display of colors on the monitor and no matter how much it costs and what kind of matrix there is, you can always choose a copy that correctly shows everything you need ...

  • Yuriy75

    I have a simple Canon 1100D often I encounter high noise when shooting in low light. Forcibly, you have to sacrifice serial shooting and shoot in raw. Since the camera itself does not always do this well.

  • Vasya

    I can’t press the button of the social network, since I am only in My World at mail.ru

  • Vasya

    Comrade, in general, this is a blog. And people use blogs for themselves. It's like a diary or even a workbook, where you write down and organize what you have learned and studied. And here the man did good - he gave him the opportunity to read his blog and gain knowledge. So your comment is absolutely irrelevant (it means “irrelevant”, and then suddenly the donut does not know such a word). Thanks to the author of the blog.

    • Arkady Shapoval

      By the way, it’s well noticed, very often a lot of different things are required from my blog, as if I have to write something to someone :)

      • NE

        We are responsible for those who are tamed :)

    • Boris

      Precisely said. Donut, don’t like, don’t come in. Once I went in and read, it means you are not the smartest, so you read and learn. Just learn in silence.

    • Eugene

      “Comrade, in general, this is a blog. And people use blogs for themselves. It's like a diary or even a workbook, where you write down and organize what you have learned and studied. "
      But this is nonsense. For myself, there are other formats for posting information, and even more suitable for this. Placing information on a public access web page already implies.
      And what about commentators - you don't have to take advice / criticism / other things to heart. A stupid person will be offended, angry and start to argue, while a smart person will endure something useful for himself, and will not pay attention to the rest.
      Some notice and try to correct the author's mistakes (moreover, the author, while observing a calm form of communication and a sufficient level of concretization, treats them positively), others stand up for his defiled pride, which is deeply mistaken. From the outside, such protection looks pretty silly. There is such a term in politics - populism ...

    • Andrey Super

      I read it as **** (discuss). Tortured me the question is what there for Ponch you got?

  • Vadim

    Good article. Surprised pictures with a butterfly o_O
    I dare to assume that the Active D-Lighting function in Nikon cameras (undoubtedly Canon has something like that) - this is the very “stretching” in highlights / shadows before saving the picture in JPG format.

  • Alexander

    I liked the article. Thanks to the author!

  • VALENTINE

    The article is certainly helpful. But I use JPG (8 bits of color depth) with the desired compression ratio mainly for storing files. To edit (no matter your own or downloaded image), I first increase it to FastStone or GIMP, then translate it to TIFF format (color depth 12 bits) using LightBox.

    • teis

      As you do not increase the color depth and size, the missing information will not appear from anywhere. For post processing, rav is much better. Try to pull the same dark photo from the ditch and from jpeg and compare the result.

      • VALENTINE

        Of course, “the missing information will not appear from anywhere”, but increasing the color depth allows you to reduce the loss of available information in post-processing editors with increased color depth.

  • anonym

    Down with djpeg long live RAV !!!

  • Elena

    Hello! Maybe I'm writing on the wrong topic ... But I hope for help. I used to take pictures with Canon D60, before that I had a Canon soap dish. Recently I gave my daughter a camera and bought myself a simpler Nikon D5100. But I noticed such a thing that before the pictures in the album were numbered with the letters IMG_, and now DSC. This is normal?

  • Konstantin

    Hello, I’m interested in whether it is possible to adjust the quality (size) of jpg images on Nikon D3200, and what do you recommend to save space?

  • Cobra

    On JPEG, they take a booze and all kinds of crap like I was fucked up, but in RAW format only masterpieces !!!

  • Vladimir

    Hello!
    At the end of the article, there is a crawl about RAW compression settings. namely "But even RAW files in some cameras go through a special 'crimp' to reduce their size, you need to be extremely careful here."
    Is there anything to read on this topic? It is with practice and analysis, and not just technical data
    Thanks for the site :)

  • Tvanges

    It's a pity the "internal" details of the zhpeg are not disclosed here. Its meaning is that the whole image is saved without loss of quality, but in b / w, which already saves space. And the color is averaged separately, in fine quality, one color is taken for four pixels. and then, the viewer just takes 2 pictures, and superimposes them on top of each other using a special algorithm. There are also a bunch of gadgets, for example, for monochrome photos (saves space) and a bunch of other things, but these are details. the bottom line is that for b / w photos, if you do not need to lighten the exposure, it will do well, and I give a 100% guarantee that in my photos after processing, none of those who swear this format can distinguish where the RAW was, where jpg.

  • Shuld

    I searched for information on how to determine the compression ratio of the jpg file from the finished file.
    The article is interesting, but did not find the necessary information.
    However, there is such an opportunity.
    Just in case, I quote the link:
    http://www.imgonline.com.ua/determine-jpeg-quality-result.php

Add a comment

christening photographer price Photography for lovers

Copyright © Radojuva.com. Blog author - Photographer in Kiev Arkady Shapoval. 2009-2021

English-version of this article https://radojuva.com/en/2013/05/jpeg-quality/comment-page-1/?replytocom=130767