Problem with converted TIFF image
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I converted a png to tiff unsigned int16. The image resulting is completely black.
This a apart of my code:
% Convert to unsigned 16-bit integer
img_uint16 = uint16(double(img) / double(intmax('uint16')) * 65535);
% Save the image as TIFF
tiffPath = fullfile(subfolderPath, [currentImage(1:end-4), '_converted.tif']);
imwrite(img_uint16, tiffPath);
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Image Analyst
2023년 12월 14일
Try
img_uint16 = uint16(double(img) / double(max(img(:))) * 65535);
or
img_uint16 = uint16(mat2gray(img) * intmax('uint16'));
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DGM
2024년 5월 12일
편집: DGM
2024년 5월 12일
Neither of these will preserve the image contrast, and the second is a disallowed mixed-class operation and will throw an error.
A = uint8([32 224]); % not a full-range image
% contrast is improperly skewed toward white for all values
B = uint16(double(A) / double(max(A(:))) * 65535)
% even if you fixed the error, it would still change the contrast
C = uint16(mat2gray(A) * double(intmax('uint16')))
% this is just an error
D = uint16(mat2gray(A) * intmax('uint16'))
While it's unlikely that the input class is signed integer, if it were, the first example would also cause gross data truncation, whereas the second would just cause the same contrast alteration.
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