Imagemagick

From Habitat: Giardino

Imagemagick

Basic

 convert file.jpeg -resize 2000x2000 output-2000.jpg

Images are enlarged or reduced just enough so as to best fit into the given size.


convert file.jpeg -bordercolor yellow -border 50 output-border.jpg

Creates a yellow border of 50px


 convert -charcoal 5 charcoal.jpeg

Charcoal effect. "5" is the value.

Tricks

Gray Scale

 magick convert -set colorspace Gray -separate -average /path/to/my/file.jpeg  export.jpeg

Monochrome

Return bitmap

magick convert -monochrome /path/to/my/file.jpeg  export.png

Colors

The number of colours can be changed

magick convert /path/to/my/file.jpeg -dither FloydSteinberg -colors 3 export.png


magick convert /path/to/my/file.jpeg -colors 3 -colorspace gray -normalize

renders:

3 colors normalization