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+--- Thread: How to save an indexed colormap? Recipe from http://gimpforums.com/ does not work! (/Thread-How-to-save-an-indexed-colormap-Recipe-from-http-gimpforums-com-does-not-work)
How to save an indexed colormap? Recipe from http://gimpforums.com/ does not work! - gnuimpcub - 02-22-2018
Hi,
I am new to this forum; not new to Gimp, but have been using it mainly for resizing or converting photos to other formats. Now I want to do something more with my new Wacom graphic tablet.
I am using Gimp 2.8.18 on Debian 9.
My Problem:
I have a nice image (photograph), convert the mode to "indexed", see the corresponding colormap under Palettes in the palette dockable window. But I cannot find a way to save this new color map for use in other images. Searching my heart out in the net, I have come to this:
Quote:- You can save the color map to a palette: open the Palettes list ((Windows>Dockable dialogs>Palettes), right-click on the list and "Import palette", then select "Image" as the source.
from http://gimpforums.com/thread-how-do-i-save-an-index-image-s-color-map
However, this does not work with me, I do not know how to name the new palette and how to save it. Can anybody help, please?
Thank you,
gnuimpcub
RE: How to save an indexed colormap? Recipe from http://gimpforums.com/ does not work! - rich2005 - 02-22-2018
Why indexed? That reduces the maximum number of colours to 256
However, too many screenshots to put in-line/attach
1. Note the difference between the Palettes dock and the Colormap dock https://i.imgur.com/U0LNU8S.jpg and the very top of the Palettes list.
2. Convert to Indexed mode and you not only get a Colormap, you get a new temporary palette top of the list. Not much you can do with that but you can duplicate it https://i.imgur.com/wcJhG58.jpg
3. Hunt down the list, right-click (lots of right-clicking involved in Gimp
) to rename to something sensible. Note there are 256 colours. https://i.imgur.com/EZ7SvnJ.jpgEdit: you can of course use this RGB method as well.
--------
To get a palette from the original RGB image is different.
1. In the palettes dialogue, right click to import https://i.imgur.com/iF437h3.jpg
2. You get the 'Import' dialogue where you can select the image, and the number of colours https://i.imgur.com/qLPGDYU.jpg
3. Then again, hunt for that palette (Lenna-imported-5), right click, rename to something sensible, note the 500 colours in this one. https://i.imgur.com/QBZPIJX.jpg
edit: there is another thread on this subject see:
https://www.gimp-forum.net/Thread-source-contains-no-colors-despite-following-the-instructions-to-import-palette
RE: How to save an indexed colormap? Recipe from http://gimpforums.com/ does not work! - gnuimpcub - 02-22-2018
Thank you! Your
Quote:...get a palette from the original RGB image
worked, but strangely I got a palette of only shades of grey though the image definetly has more colors! However, miraculously there appeared now also a palette with more colors, I must have done previously (indexed) and had not noticed before. This palette stuff still is a closed book to me.
Obviously I need more practise
RE: How to save an indexed colormap? Recipe from http://gimpforums.com/ does not work! - gnuimpcub - 02-22-2018
Obviously I need much, much more practise
Now I lost my Tool Options from the Toolbox. Could recover Tool Options from Windows>Dockable Dialogues, but the Tool Options will not dock again to the Toolbox, try as I might. I searched Gimps Help, I googled, found recipes but nothing works as described. I remember that I could do it years ago, but I cannot remember how I did it 
I am totally, totally frustrated
Maybe somebody looks here and could help with a working recipe for Gimp 2.8.18 on Linux?
RE: How to save an indexed colormap? Recipe from http://gimpforums.com/ does not work! - rich2005 - 02-22-2018
Windows -> Dockable Dialogues -> Tool Options
That gets a tab alongside layers and things in the Dialogues.
Click on the tab and drag into the area that says You can drop dockable dialogs here
edit: some screenshots here: https://www.gimp-forum.net/Thread-Gimp-Installation?pid=4702#pid4702
RE: How to save an indexed colormap? Recipe from http://gimpforums.com/ does not work! - gnuimpcub - 02-22-2018
(02-22-2018, 07:10 PM)rich2005 Wrote: Windows -> Dockable Dialogues -> Tool Options
That gets a tab alongside layers and things in the Dialogues.
Click on the tab and drag into the area that says You can drop dockable dialogs here
edit: some screenshots here: https://www.gimp-forum.net/Thread-Gimp-Installation?pid=4702#pid4702
Thanks, of course I had done this. Nothing docked! However, after having Gimp closed for some time and opening it again - voila it was docked.
RE: How to save an indexed colormap? Recipe from http://gimpforums.com/ does not work! - gnuimpcub - 02-23-2018
Details: I deleted fhe folder ".gimp-2.8" in my home directory, logged out, restarted my computer, started Gimp, and the Dockable Dialogs had docked again. Since I had a backup of my customized color palettes, no problem.
RE: How to save an indexed colormap? Recipe from http://gimpforums.com/ does not work! - Ofnuts - 02-23-2018
(02-23-2018, 05:59 PM)gnuimpcub Wrote: Details: I deleted fhe folder ".gimp-2.8" in my home directory, logged out, restarted my computer, started Gimp, and the Dockable Dialogs had docked again. Since I had a backup of my customized color palettes, no problem.
Deleting the sessionrc in that directory is enough, that's where Gimp keeps the window positions.