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corner up and/or left to make it so, simultaneously increasing the region
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dimensions to keep the lower right crop corner unchanged. (Thus, the
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output image covers at least the requested region, but may cover more.)
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are enhancements from http://sylvana.net/jpegcrop/ that may not be available on
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The image can be losslessly cropped by giving the switch:
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Crop to a rectangular subarea of width W, height H starting at point X,Y.
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Another not-strictly-lossless transformation switch is:
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This option discards the chrominance channels if the input image is YCbCr
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(ie, a standard color JPEG), resulting in a grayscale JPEG file. The
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luminance channel is preserved exactly, so this is a better method of reducing