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jpegtran

Perform lossless transformation of JPEG files. More information: https://linux.die.net/man/1/jpegtran.

  • 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}}