Hello,
I'm beginner to the gimp and come from photoshop.

I'll would like to know how change the color of the alpha channel.

I"ll would like to paste a color into or paint on it.

How I'll could do it?

In photoshop it was simple I'll make an image in grey >ctrl C >ctrl v in alpha channel.

Ill would like to do the same but it seems impossible to edit the alpha!

I'll work mainly in video game and need to use Alpha channel.

In fact I'll don't care there is an alpha on alpha channel I'll just want to copy a grey image on it.

Thanks by advance for your help.

I am making fun with a best friend of mine

I have his picture. He isn't bald in the picture, but I want to make him bald, however, what is the general
step I need to do to make the pictures look, at least, not too bad?

First, I know I should select to remove his hair, but how to make the deleted area look similar to the background?

Second, how can I make his forehead a bit shiny? In the picture there isn't any shiny

My plugin performs a bunch of operations on dozens of large images which takes several minutes and only uses a single thread.

I'm wondering if there's a way to write code in the plug-in to allow for multithreading, e.g. by telling Gimp to open more instances of itself or any other way.

Is that possible?

Hi, today I used gimp for the first time in a while, and for some reason when I try to cut a part of a layer, instead of just making the part disappearing like it used to, it turns the part white.
Left is what I want to do, and what I was used to, right is what I'm getting.

Anyone knows why it does that and how to fix it ?

Hallo Admins
I am forced to register again, 

But the way to get back to an old one is horrible for an old man like me a grandpa of 78

I am too OpaPeter ? PeterPKHG ? Peter78 (from 1 to year ago)

Please tel me what with those old accounts could be done

Had posted a lot earlier (an even lately , this week)
And I need to speak to OffNuts ;-)

Greetings 
     Peter

Using python-fu, is there a way to list the layer names of an xcf file without loading the whole file?

Right now I list them like this:

Hello! Newcomer here. I have two GIFs (let's say A.gif and B.gif) both with an equal amount of frames, but their size is different. They need to be interleaved: A-Layer1 -> B-Layer1 -> A-Layer2 -> B-Layer2 and so on.

How do I achieve this? There seems to be no automatic option from what I can tell, but there has to be. Is there something I'm missing? Or do I need a plugin for this?

I'd do it manually, except working with 1152*2=2304 layers... oof. It's actually making my computer lag at points, making doing it manually feel even more awful than it otherwise would've been.

EDIT: OK, I may be stupid, I did see ofn-interleave-layers as a google result, but misread what it does, though it could only interleave copies of one layer between the image layers. And its documentation ALSO lists how to change image size with canvas commands without scaling.

I'm leaving this thread in case someone else needs it, I've seen enough "nevermind, figured it out" online to want to leave a tip. I haven't tested the script YET, but it should work.

When i want resize image to format 800 x 800 px from 16 x 16 px what do i must do? I opened image that naturally is 16 x 16, and i just want to make it bigger and keep resolution. I tried to make minecraft dirt block to be in 800 x 800 format. 
And when i resize it to 800 x 800 this happens: 
What i need to do is to have same image in 16 x 16 and sam image in 800 x 800. Im sorry for this coplications but im starting with gimp.

I wonder why a do not get a sharp result when erasing with a brush and get a dark contour when turn the brush 90 degrees. The working layer is transparent. In the middle there are two brushes drawn with the pencil tool. On the left the one brush is turned 90 degrees and there is a dark boundary around it. When I use both brushes to erase a line, then erasing is not pixel sharp.Do I miss something or is it a bug? Thanks for your answer in advance.
 
  brush error.zip (Size: 29.82 KB / Downloads: 326)

I am trying to add an arrow pointer onto a picture (and plan to do a lot). I have added a png of the arrow, which I know has a transparent background, to a second layer. I have tried to set it up as a mask, but dont understand the finer details - it just stays as a complete rectangle. NB: Have successfully re-sized it & am trying to rotate it. I am new to GIMP, but IT competent.