[SOLVED] Reduce 16 to 8 bits/channel with dithering

Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
Lecram
Posts: 13
Joined: 2018-07-28T12:00:45-07:00
Authentication code: 1152
Location: Germany

Re: [SOLVED] Reduce 16 to 8 bits/channel with dithering

Post by Lecram »

I have created a possible bug report on this topic.

Given that
[…] I've found out that GIMP 2.10 now offers dithering when reducing bit depth […]
I would consider this thread as being solved.

Unfortunately this has to be done manually. As of now, GIMP does not expose this functionality to its scripting languages Script-Fu and Python-Fu.

Please see this thread and this bug report for further reference.
snibgo
Posts: 12159
Joined: 2010-01-23T23:01:33-07:00
Authentication code: 1151
Location: England, UK

Re: [SOLVED] Reduce 16 to 8 bits/channel with dithering

Post by snibgo »

I confirm we get only 64 shades, and I don't know why. I'm looking into it.

However, note that your "-remap palette.png -dither FloydSteinberg" is wrong. "-dither" is a setting that is used by "-remap", so should come before it, not after.
snibgo's IM pages: im.snibgo.com
Lecram
Posts: 13
Joined: 2018-07-28T12:00:45-07:00
Authentication code: 1152
Location: Germany

Re: [SOLVED] Reduce 16 to 8 bits/channel with dithering

Post by Lecram »

Thank you. I appreciate that.
Post Reply