Indexing Help

Deblk · **Joined:** Dec 22, 2011 **Posts:** 385

GIMP Version: 2.8.10
Operating System: Windows
GIMP Experience: Beginner Level

Hiya...for some reason on a particular image I want to index to a few colours but however many I use it does not want to pick up white...any ideas please, thanks.

Odinbc · **Posted:** Thu Jul 31, 2014 2:44 pm **(#2)**

What are you using Colormap?

Deblk · **Joined:** Dec 22, 2011 **Posts:** 385

Sorry...I am not sure. Using the Gimp default. I have not had problems with other images.

Odinbc · **Posted:** Thu Jul 31, 2014 2:54 pm **(#4)**

I was not sure what you are trying to do (your workflow).
Are you using, Image | Mode | Indexed... and checking with Colormap?
...or are you trying to apply a limited palette?

Deblk · **Joined:** Dec 22, 2011 **Posts:** 385

Odinbc wrote:

I was not sure what you are trying to do (your workflow).
Are you using, Image | Mode | Indexed... and checking with Colormap?
...or are you trying to apply a limited palette?

All I am doing is Image/mode/index/convert
If I change the background colour to white it then works...confused.com lol

rich2005 · **Joined:** Mar 04, 2011 **Posts:** 2419

Pleased you found your solution.

You have to have some white in the image for it to register in the colormap.
Usually at the end and fades into the background so you think nothing is there. Tends to convert to not-pure-white #ffffff as well

Totally off-topic but using an indexed image was a way of concealing a message.

Edit the colors to hide the text, duplicate colours are not a problem.
[edit] excuse the error I have those the wrong way round.

Then to reverse the procedure look for duplicate colours and assign a colour to them.