jpegtran

Perform lossless transformation of JPEG files. More information: https://manned.org/jpegtran.

• Mirror an image horizontally or vertically:

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

• Rotate an image 90, 180 or 270 degrees clockwise:

jpegtran {{[-ro|-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 {{[-g|-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}}