Post Reply 

Time-based gradient brush

Dec 13, 2011, 01:54
Post: #1
Time-based gradient brush
Hi all,

I'm quite new to the GIMP, though fairly experienced with Photoshop.

I have a rather unusual requirement, and I'm wondering if the GIMP can
meet it.

I'd like to set up a gradient and then draw freehand trails with a brush
that gets its colours from the gradient, sawtooth style. So far, so good;
I know how to do that.

What's unusual, is that I'd actually like the colours to cycle through the
gradient by time, not by distance. In other words, if I move the mouse
slowly, the colour sequence will be compressed, and if I move it faster,
it'll be stretched out.

Is this possible?

I seem to recall that there's an animated brush feature... maybe that's
the way to go? Can it animate through a sequence of colours?

If you're wondering why I want this, it's because I want to emulate
what it would look like if you looked at the Crab Pulsar (from, say, a mere
few AU) via a small pocket mirror, and rocked the mirror rapidly by hand.
So now you know. :-)

"Why?" you ask? I'm writing a book. That's a good excuse for anything. :-)

By the way, 2.7 doesn't seem to have the "Use colors from gradient" option
for the brush. Had to revert to 2.6 to match the online tutorials I found...
In fact, in 2.7 I couldn't find any way to paint with a gradient (except
"random").

Thanks!
Dan
Find all posts by this user
Quote this message in a reply
Dec 13, 2011, 09:59 (This post was last modified: Dec 13, 2011 10:20 by ofnuts.)
Post: #2
RE: Time-based gradient brush
An animated brush won't do. The images are produced when you move by one brush spacing. And whatever the brush you use this will aways apply so I don't see how you can use standard brush dynamics to achieve this.

If you are dealing with a single straight line then drawing a linear gradient and then stretching it non-uniformly may be a solution.

PS: PM'ed you.

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
Dec 13, 2011, 15:38
Post: #3
RE: Time-based gradient brush
Thanks for the idea about stretching a linear trace. Not sure I can
make that look the way I want.

And thanks for the PM; we're going deeper into the topic there.
Find all posts by this user
Quote this message in a reply
Dec 20, 2011, 11:22
Post: #4
RE: Time-based gradient brush
Please provide me some more details since I am looking forward to do adobe photoshop course.
Find all posts by this user
Quote this message in a reply
Dec 21, 2011, 05:42
Post: #5
RE: Time-based gradient brush
(Dec 20, 2011 11:22)kevindoug Wrote:  Please provide me some more details since I am looking forward to do adobe photoshop course.
Hi Kevin,
Are you looking for more details on what I'm looking for, or more details
on how one would do it in the GIMP? I would be happy to PM you with
full details of my crazy idea, and if it's something you would like to try
to achieve, that would be great!
Dan
Find all posts by this user
Quote this message in a reply
Post Reply 


Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Brush Lagging/Dragging Skrib 1 143 Aug 2, 2017 12:13
Last Post: ythgilb
  mysteriously transferred brush? aliJ34 2 290 Sep 26, 2014 02:53
Last Post: aliJ34
Question Having a hard time re-installing GIMP D-R0CK 1 249 Aug 23, 2014 05:23
Last Post: D-R0CK
  brush hardness not working with drawing tablet Angel_Blue 2 379 Aug 1, 2014 19:23
Last Post: Angel_Blue
  Problem with Cursor/Brush tip Pyrefly 5 492 Jul 24, 2014 15:59
Last Post: iForStyle007

Forum Jump:


GIMP ForumPortalArchiveContactTermsRSS