Dither
Inspired by: http://www.tannerhelland.com/4660/dithering-eleven-algorithms-source-code/
- no dithering:
- one_bit black and white floyd_steinberg dithering
- CGA 16-color mode, sierra 3 dithering:
License: MIT
CLI help:
usage
example:
args
INPUT
the path to an input image. known good image formats are .png
and .jpg
.
OUTPUT
the path to write the output. this will create or truncate the file at the existing location, if necessary. the image type will be inferred from the filename. currently, only .png
and .jpg
are supported.
-c
, --color
The color mode to use. Default is "bw" (black and white). Color mode to use.
"color"
(all colors with specified bit depth)
"bw"
black and white mode (grayscale in higher birt depths)
$COLOR
single-color mode. options are
- BLUE
- GREEN
- CYAN
- RED
- MAGENTA
- BROWN
- LIGHT_GRAY
- GRAY
- LIGHT_BLUE
- LIGHT_GREEN
- LIGHT_CYAN "LIGHT_RED"
- LIGHT_MAGENTA
- YELLOW
- WHITE
"$FRONT $BACK"
user specified 1bit user color palette, where the first is foreground in hexidecimal and the second is background. eg, "0xaabbcc 0x000000"
cga
sixteen-color CGA. ignores bit depth; casues error on bit depth > 1
-d, --dither
The type of ditherer to use. Available options are
"floyd"
,"steinberg"
,"floydsteinberg"
(default, floyd-steinberg dithering)"atkinson"
,"stucki"
,"burkes"
,"jarvis"
,"judice"
,ninke"
Jarvis-Judice-Ninke dithering"sierra"
,"sierra3"
Sierra dithering
-v, --verbose
Verbose debug output
--depth
Default 1. Bit depth should be an unsigned integer between 1 and 7. The number of bits to compress each channel to.