how to save a double m*n*3 matrix as one of image formats with no losing informataion?
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Hi. I have a double m*n*3 matrix and I want to save it as one of the standard image formats. I converted it to uint16, and saved it as png:
imwrite(im2uint16(im)),'rgb.png','BitDepth',16,'map','RGB','Mode','lossless');
but when I read it again
i =imread('rgb.png');
% convert it to double again
i=im2double(i)*255;
some pixels had changed one number bigger or smaller. How can I prevent it?
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Image Analyst
2016-9-10
Don't use im2uint16. Just use uint16. Your floating point data had better be integers in the uint16 range though. Otherwise the number will get changes as it's rounded to the nearest integer. If you want to retain the full floating point accuracy, then use save() to save it to a .mat file, instead of using imwrite().
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