#577 convert +dither does not work as expected

[Zirneklitis]

“+dither” option does not suspend dithering. The command:
for attels in *.tif; do gm convert -depth 8 -fuzz 10% +dither $attels -colors 63 +dither -map colours.png -quality 100 $attels.png ; done
generates an image with dithered colours.

[Bob Friesenhahn]

Please try putting your +dither request immediately after the input file name (e.g. right before -colors or -map) rather than before the input file name. The -fuzz option is used for color matching but is not used when reducing to a colormap with -colors or -map so it serves no purpose for your command.

[Bob Friesenhahn]

As described previously, the command line is parsed from left to right. This means that the -colors request needs to come after +dither. This is a usage error.