Write image info using imwrite or other method

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Abdulllah 2021-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/891857-write-image-info-using-imwrite-or-other-method

评论： Walter Roberson 2021-8-4

How to write imag info when writing an image. I can read the image info from one file using imfinfo but I can not find a way to wirte the info when writing the image, e.g., I have an image A and I want to write its info to an other image say B (as image properties/details).

Specifically, I want to write campera properties, e.g., exposure time, f-stop etc from one image to an other image

A_img_info=imfinfo('A.jpg');
A_img_info= A_img_info.DigitalCamera;
A_expTimes =A_img_info.ExposureTime;
%say B is an other image and write the A_expTimes to B
imwrite(B,'B.jpg') %how to write A_expTimes in the properties?

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Answer 1

Walter Roberson 2021-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/891857-write-image-info-using-imwrite-or-other-method#answer_760282

You cannot do that using imwrite().

Most of what you want to write is EXIF information. MATLAB does not support writing EXIF information.

See https://www.mathworks.com/matlabcentral/fileexchange/42000-run_exiftool for a File Exchange Contribution that invokes an external program to do the writing.

See also https://www.mathworks.com/matlabcentral/answers/349701-overwrite-an-image-with-new-imfinfo-data#answer_275016

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Answer 2

KSSV 2021-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/891857-write-image-info-using-imwrite-or-other-method#answer_760277

Read the documentation, thre are options mentioned to write into image.

https://in.mathworks.com/help/matlab/ref/imwrite.html

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Abdulllah 2021-8-4

编辑：Abdulllah 2021-8-4

在 MATLAB Online 中打开

imwrite(B,'B.jpg','jpg','comment','ExposureTime = 1.0')

The statement executed, however, it did not write the values in the properties/details.

Walter Roberson 2021-8-4

You will not be able to use imwrite() to write properties such as Exposure Time. In JPEG files, those are recorded as EXIF information, which is structured binary data. For example, Exposure Time is EXIF binary tag 0x829A https://www.awaresystems.be/imaging/tiff/tifftags/privateifd/exif/exposuretime.html

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