convert
## Input file
[ FORMAT ':' ] INPUT_FILE.EXT [ '[' FRAME ']' ]
FORMAT and FRAME are optional parameters.
FORMAT specifies the format of the image data; it's useful
when dealing with stdin. FRAME can be used to select a
frame from a composite (PS/PDF) or animated (GIF) image.
## Output options
-resize WIDTH 'x' HEIGHT | GEOMETRY
Resizes the input to fit the passed geometry
-filter 'interpolative' | 'point' | 'box' | 'triangle' | ...
The filter to be used when resizing; use 'point' for pixel
art, or better, the '-sample' option
-sample WIDTH 'x' HEIGHT
Like '-resize' with '-filter point', but faster
-quantize 'RGB' | 'CMY' | 'sRGB' | 'GRAY' | ...
The colorspace to be used by the output
-dither 'none' | 'Riemersma' | 'FloydSteinberg'
The algorithm to be used when dithering; see 'convert
-list dither' for a list
-colors N
How many colors to include in the output palette
