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32 lines
1.2 KiB
Markdown
32 lines
1.2 KiB
Markdown
# jpegtran
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> Perform lossless transformation of JPEG files.
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> More information: <https://manned.org/jpegtran>.
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- Mirror an image horizontally or vertically:
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`jpegtran -flip {{horizontal|vertical}} {{path/to/image.jpg}} > {{path/to/output.jpg}}`
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- Rotate an image 90, 180 or 270 degrees clockwise:
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`jpegtran -rotate {{90|180|270}} {{path/to/image.jpg}} > {{path/to/output.jpg}}`
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- Transpose the image across the upper left to lower right axis:
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`jpegtran -transpose {{path/to/image.jpg}} > {{path/to/output.jpg}}`
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- Transverse the image across the upper right to lower left axis:
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`jpegtran -transverse {{path/to/image.jpg}} > {{path/to/output.jpg}}`
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- Convert the image to grayscale:
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`jpegtran -grayscale {{path/to/image.jpg}} > {{path/to/output.jpg}}`
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- 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:
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`jpegtran -crop {{W}}x{{H}} -outfile {{path/to/output.jpg}} {{path/to/image.jpg}}`
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- Crop the image to a rectangular region of width `W` and height `H`, starting at point `X` and `Y` from the upper left corner:
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`jpegtran -crop {{W}}x{{H}}+{{X}}+{{Y}} {{path/to/image.jpg}} > {{path/to/output.jpg}}`
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