Post Reply 

using the select color tool on pixels w/transparency

Mar 28, 2012, 14:07
Post: #1
using the select color tool on pixels w/transparency
Ok, I'm obviously new to GIMP. I was using Paint.net but I've found it too limited. The GIMP has much more power and I can do a lot more with it, but I've found a few things I can't figure out how to do.

For example, when I use the Eyedropper tool (Colorpicker) to choose a color, GIMP doesn't seem to include any transparency in the selection:
   

The Colorpicker just chooses the color at 100% opacity. Is there any way to change this so that my new foreground color includes the transparency level?
Find all posts by this user
Quote this message in a reply
Mar 28, 2012, 15:46 (This post was last modified: Mar 28, 2012 15:49 by ofnuts.)
Post: #2
RE: using the select color tool on pixels w/transparency
No, the color picker doesn't set any opacity since the foreground/background color are only RGB values. Transparency is really a matter of adjusting opacity on the paint tool, or painting at 100% brush opacity on an additional layer and setting the layer opacity instead.

In many cases you want to keep the opacity of pixels even when changing their color (anti-aliasing pixels on borders for instance). This is what the alpha-lock is meant for:

[attachment=1053]

Now answering your questions on
https://Gimp-Forum.net
Visit this user's website Find all posts by this user
Quote this message in a reply
Mar 28, 2012, 17:52 (This post was last modified: Mar 28, 2012 17:53 by Capt Sam.)
Post: #3
RE: using the select color tool on pixels w/transparency
Thanks! Now I know what the Alpha lock does! I don't remember Paint.net having that feature. I can think of how useful it will be.
Find all posts by this user
Quote this message in a reply
Mar 28, 2012, 21:49
Post: #4
RE: using the select color tool on pixels w/transparency
Wow thanks! I always wondered what that little chain symbol meant.

It is a trade off, I suppose. Paint.net could select the Alpha, but it could not lock the layer's Alpha.

In any event, I'm pretty well convinced GIMP is my new editor of choice. The simple airbrush tool has totally converted me.
Find all posts by this user
Quote this message in a reply
Mar 28, 2012, 22:03
Post: #5
RE: using the select color tool on pixels w/transparency
In fact there is little purpose fixing the alpha in the color. That's one of the first things you want linked to the stylus pressure when you use a tablet (plenty of Gimp's features start making a lot of sense the day you use a tablet).

Now answering your questions on
https://Gimp-Forum.net
Visit this user's website Find all posts by this user
Quote this message in a reply
Post Reply 


Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  select multiple layers in the Layers Dialog user5555155 1 45 Aug 14, 2017 14:19
Last Post: ythgilb
  Using the Elipse tool bl665 1 50 Jul 28, 2017 06:07
Last Post: ythgilb
  Image color vs color picker YalithKBK 1 111 Jul 7, 2017 11:45
Last Post: ythgilb
  Change transparent background color Firion 1 141 Jun 14, 2017 05:24
Last Post: ythgilb
  Checkerboard transparency toggle rahdad1 4 153 Oct 9, 2014 16:14
Last Post: rahdad1

Forum Jump:


GIMP ForumPortalArchiveContactTermsRSS