Imwrite JPG with comments

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YT 2019-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/443414-imwrite-jpg-with-comments

评论： Walter Roberson 2019-2-12

I'm trying to save my images with some comments like so

imwrite(imageData, '/MATLAB Drive/ArtScraper/out_img/Ukiyo-e_1549412662/592fa615edc2c933948514b7.jpg' 'Comment', {['Title: ' nStyle(jj).title '; Author: ' nStyle(jj).artistName '; Year: ' nStyle(jj).year]});

To check if the comments were written correctly I used imfinfo

struct with fields:
           Filename: '/MATLAB Drive/ArtScraper/out_img/Ukiyo-e_1549412662/592fa615edc2c933948514b7.jpg'
        FileModDate: '06-Feb-2019 00:36:24'
           FileSize: 37242
             Format: 'jpg'
      FormatVersion: ''
              Width: 327
             Height: 520
           BitDepth: 24
          ColorType: 'truecolor'
    FormatSignature: ''
    NumberOfSamples: 3
       CodingMethod: 'Huffman'
      CodingProcess: 'Sequential'
            Comment: {'Title: Ichikawa Monnosuke Ii as Date No Yosaku in the Kabuki Play "koi-nyōbō Somewake Tazuna"; Author: Tōshūsai Sharaku; Year: 1794'}

Now I was under the assumption that image now contains comments if I'd check the properties but sadly that wasn't the case

So I'm either doing something wrong with writing comments to my images or the comments are only visible in Matlab and I misunderstood the documentation. Either way, I still need to add this additional information to my files.

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Walter Roberson 2019-2-12

28 234 is 1c ea in hex. If we assume Little Endian then 0Xea1c which appears to be a Microsoft patented (!!) WindowsPadding tag. Basically it is space reserved in the file in anticipation that you might add more tags.

Walter Roberson 2019-2-12

My guess is that the comments were stored as UTF16, probably little endian. Do the numeric values alternate 32 and something useful or do they alternate 0 and something useful like would be the case for utf16?

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回答（1 个）

Rik 2019-2-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/443414-imwrite-jpg-with-comments#answer_360392

在 MATLAB Online 中打开

For my FEX submission PhotoAnnotation I bypass the built-in tools in favor of exiftool.

URL=['http://web.archive.org/web/20170820125224if_/',...
    'https://www.sno.phy.queensu.ca/~phil/exiftool/exiftool-10.61.zip'];
urlwrite(URL,[folderpath 'exiftool.zip']);

You can either canibalize some functions I use in my GUI, or go through its documentation yourself. (I have no clue anymore how it works outside of my specific work flow, which I would say is both the upside and the downside of modular programming.)

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YT 2019-2-10

Well exiftool seems easy to use (from the lines I've seen in your function) but I don't really want to use another tool besides Matlab.

Rik 2019-2-11

Of course that is your decision to make. At least you have a backup method in case you don't get the pure-Matlab method to work.

For me exiftool was the better fit, as I wanted to use the same function in Octave as well, and the comment writing is not (yet?) implemented. (Or at least in the version I was using when writing PA)

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