Problem saving an image as jpg

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Angela
Angela on 16 Apr 2019
Commented: Walter Roberson on 16 Apr 2019
I am running a procedure in several images and I am trying to save a smaller jpg image (along with a lossless tif image) for quick inspection to make sure the program runs ok. So far I never had troubles and the program has run successfully for 200 images and saved the equivalent results.
Today one of the images failed to save and gave me this error message
''Error using wjpg12c
JPEG library error (12 bit), "DCT coefficient out of range".
Error in writejpg (line 127)
wjpg12c(data,filename,props);
Error in imwrite (line 485)
feval(fmt_s.write,data,map,filename,paramPairs{:});''
The same image was previously saved as a tif with no problems. The command i used to save the image as jpg is
imwrite(im2uint16(NewImage),outfile,'BitDepth',12,'Mode','lossy')
Has anyone encountered this error before? I am using Matlab 2018a.
  2 Comments
Walter Roberson
Walter Roberson on 16 Apr 2019
Hunting through my memory I seem to recall that coefficients out of range is possible but expected to be very rare. Unfortunately I never figured out the circumstances under which it could happen... high contrast in just the wrong pattern or something like that.

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