This is the command pngnq that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
pngnq - quantize png images
SYNOPSIS
pngnq [-vfhV][-s sample_factor ][-Q dither ][-g gamma ][-e extension ][-d dir ][-n colors
][ inputfiles ]
DESCRIPTION
pngnq quantizes a 32-bit RGBA PNG image to an 8 bit RGBA palette PNG using the neuquant
algorithm. The output file name is the input file name extended with "-nq8.png" loading="lazy" or a
specified extension.
OPTIONS
-v Verbose mode. Prints status messages.
-f Force overwriting of files.
-s sample factor
Sample factor. The neuquant algorithm samples pixels stepping by this value. The
default value of 3 gives good results. Higher values sample less of the image
pixels and thus are faster but less accurate. A factor of 1 samples every image
pixel.
-n colors
Specifies the number of colors to quantize to. Defaults to 256 which is the
maximum. The minimum here is 2.
-Q dither
Choose a dithering method: n = no dither (default), f = Floyd Steinberg dithering.
-g gamma
Set the image gamma correction. If not present, uses the png file's gamma or
defaults to 1.0.
-e extension
Specifies the new filename extension. Defaults to "-nq8.png". Pngnq drops .png
from the original filenames. If you set the argument of the -e option to .png and
choose the -f option the input file will be overwritten.
-d dir Tells pngnq to put output files in a directory other than the one the input files
are in.
input files
The png files to be processed. Defaults to standard input if not specified. If
standard input is being processed the output is sent to standard output.
-h Print program help.
-V Print version number and library versions.
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