Problem saving an image as jpg

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Angela 2019-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/456778-problem-saving-an-image-as-jpg

评论： Walter Roberson 2019-4-16

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.

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Image Analyst 2019-4-16

Attach your image variable in a .mat file so we can try it.

Walter Roberson 2019-4-16

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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