TLDR
Enter a command. For example: dmesg, chntpw, aspell, apt add repository.

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 {{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}}

This is a tldr pages (source, CC BY 4.0) web wrapper for cheat-sheets.org. All commands, popular commands, most used linux commands. Referrals. Progressive Web Application (PWA) version to install on your device.