How to add 'Description' to '.jpeg'?

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Pawel Jastrzebski
Pawel Jastrzebski 2018-3-20
评论： Pawel Jastrzebski 2018-3-21
Once I've generated a plot and saved it as .jpeg, I'd like to add a description to it i.e.:
  • 'This plot was created with script version 01'
The code for saving the plot is simple:
x = 0:0.1:4
fig(1) = figure
plot(x,x.^3)
saveas(fig(1),'fig.jpg')
And then I tried to access the image info to modify it but to no avail:
fileName = 'fig.jpg';
i = imread(fileName)
info = imfinfo(fileName)
info.Comment = 'Made with script version 1';
imwrite(i,'figC.jpg')
QUESTIONS:
  1. Is what I'm trying possible?
  2. If so, how?
Many thanks.

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采纳的回答

C.J. Harris
C.J. Harris 2018-3-20
If you're only interested in the 'Comment' field, then you can set it directly:
imwrite(i,'figC.jpg', 'Comment', 'Made with script version 1')
  1 个评论
Pawel Jastrzebski
Pawel Jastrzebski 2018-3-21
Thanks, it worked. I've run a few trials:
fileName = 'fig.jpeg';
i = imread(fileName);
imwrite(i,'figC.jpeg',...
'Comment','JPEG: Made with script version 1')
imwrite(i,'figC.png',...
'Comment' ,'PNG: Made with script version 1',...
'Author' , 'PJ',...
'Description','simple plot',...
'Copyright' ,'Open')
imwrite(i,'figC.tiff',...
'Description','TIFF: script version 1')
However what I have established is that:
  • A viewer such as IrfanView is needed to see the comment as it doesn't appear on the property section when I right-click on the file
  • When I use other file formats, I still cannot see it under the properties of a file
  • Using Irfanview I cannot see the comments for '.png' and '.tiff
  • The comments will show up in GIMP for all three extensions
  • And lastly, .png offers even more flexibility in adding information to the file which is exactly what I might need for the tractability, I just need to figure an easy way of checking up the details on Windows

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