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jpegtran

Perform lossless transformation of JPEG files.

More information.

Mirror an image horizontally or vertically:

jpegtran -flip {horizontal|vertical} {path/to/image.jpg} > {path/to/output.jpg}

Rotate an image 90, 180 or 270 degrees clockwise:

jpegtran -rotate {90|180|270} {path/to/image.jpg} > {path/to/output.jpg}

Transpose the image across the upper-left to lower right axis:

jpegtran -transpose {path/to/image.jpg} > {path/to/output.jpg}

Transverse the image across the upper right to lower left axis:

jpegtran -transverse {path/to/image.jpg} > {path/to/output.jpg}

Convert the image to grayscale:

jpegtran -grayscale {path/to/image.jpg} > {path/to/output.jpg}

Crop the image to a rectangular region of width `W` and height `H` from the upper-left corner, saving the output to a specific file:

jpegtran -crop {W}x{H} -outfile {path/to/output.jpg} {path/to/image.jpg}

Crop the image to a rectangular region of width `W` and height `H`, starting at point `X` and `Y` from the upper-left corner:

jpegtran -crop {W}x{H}+{X}+{Y} {path/to/image.jpg} > {path/to/output.jpg}

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