jpegtran

Perform lossless transformation of JPEG files. More information: https://manned.org/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 WxH -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 WxH+X+Y path/to/image.jpg > path/to/output.jpg