mogrify (1) - Linux Manuals
mogrify: resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more. Mogrify overwrites the original image file, whereas,
Command to display mogrify manual in Linux: $ man 1 mogrify
 
NAME
mogrify - resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more. Mogrify overwrites the original image file, whereas, 
convert-im6.q16(1) writes to a different image file.
SYNOPSIS
- mogrify-im6.q16 [options] input-file 
- 
OVERVIEW
The 
mogrify-im6.q16 program is a member of the 
ImageMagick-ims6.q16(1) suite of tools.  Use it to resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more. This tool is similar to 
convert-im6.q16(1) except the original image file is overwritten with any changes you request.
For more information about the mogrify command, point your browser to file:///usr/share/doc/imagemagick-6-common/html/www/mogrify.html (on debian system you may install the imagemagick-6 package) or https://www.imagemagick.org/script/mogrify.php.
DESCRIPTION
Image Settings:
 
 -adjoin              join images into a single multi-image file
  -affine matrix       affine transform matrix
  -alpha option        activate, deactivate, reset, or set the alpha channel
  -antialias           remove pixel-aliasing
  -authenticate value  decrypt image with this password
  -attenuate value     lessen (or intensify) when adding noise to an image
  -background color    background color
  -bias value          add bias when convolving an image
  -black-point-compensation
                       use black point compensation
  -blue-primary point  chromaticity blue primary point
  -bordercolor color   border color
  -caption string      assign a caption to an image
  -cdl filename        color correct with a color decision list
  -channel type        apply option to select image channels
  -colors value        preferred number of colors in the image
  -colorspace type     alternate image colorspace
  -comment string      annotate image with comment
  -compose operator    set image composite operator
  -compress type       type of pixel compression when writing the image
  -decipher filename   convert cipher pixels to plain pixels
  -define format:option
                       define one or more image format options
  -delay centiseconds  display the next image after pausing
  -density geometry    horizontal and vertical density of the image
  -depth value         image depth
  -direction type      render text right-to-left or left-to-right
  -display server      get image or font from this X server
  -dispose method      layer disposal method
  -dither method       apply error diffusion to image
  -encipher filename   convert plain pixels to cipher pixels
  -encoding type       text encoding type
  -endian type         endianness (MSB or LSB) of the image
  -family name         render text with this font family
  -features distance   analyze image features (e.g. contrast, correlation)
  -fill color          color to use when filling a graphic primitive
  -filter type