Hello everyone. I have this simple normal image. What i want to do is to edit alpha channel as a curve, but based on Red and Green channel. RGB channels must remain unchanged ("colour to alpha" change them). I know Colours - Levels/Curve tools, thats ability i want, but i haven't find out how to use input channel different from output channel. So i can edit for example Red in different shades of Red, but not based on Green. 
 I really need it similar to curve, in my example image there is only few shades, but i want to learn proper workflow for complex images too.

I'm using GIMP 2.10. I'm total gimp newbie, i use it only for simple edits of my textures.. So please detailed answer is appreciated.

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Hiya. I've been using Gimp since wayyyyy back (I forgot the version). "Back in the day", a whole slew of canned logo's, bullets etc. were included with the installation (Chrome, Basic I/II, Starburst, Frosty, Alien Glow, etc.) Are these available anymore?

They were found at: File/Create/Logos...

Thanks, Dana

I made a plugin to crop a path, similar to cropping an image or a layer. I don't know any such tool in Gimp previously, but what I know about Gimp is very limited, so please enlighten me if I am wrong.

Actually I made four plugins, two for cropping, two for slicing:

1. Crop path by convex polygon
   
2. Crop path by rectangle
   
3. Slice path by guides
   
4. Slice path by lines
   

1. a rectangular selection
   
2. four guides (two horizontal, two vertical)
   
3. image (canvas)
   
4. the active layer.
   

Hi!
Created simple business card. Some text boxes, one image. Saved. 
Now opened it and if I click on Text tool and then on text, it changes size. Cannot figure out how to edit text without damaging it's size. In layers it show as A - I guess as text layer. Right click on layer and Edit on canvas gives the same result.

I downloaded and ionstalled the latest Gimp 2.10.22 in windows 64.
However now I find all my scripts -Fu and python plug in are greyed out.
How do I restore all these scripts and plugins

I am sorry I found out that this was because I had not opened any imgae in Gimp. Once I opened an image everything was OK.

If I'm using a brush to erase/remove fragments/particles of an image, how can I get 100% removal of everything the brush touches? I don't want any "grey" transition fading left. I want to use a "splatter" brush to remove particles...completely.

I have picture I'm working on with several layers. There is an area of alpha, and a border around it on another layer and another layer has an image of some  leaves.  I'd there is a gap of alpha between the colored border and the leaves. I'd like paint or clone over the gap of alpha.

I've tried adding another layer, raising and lowering layers. It is just locked somehow. I've tried pressing the little chekerboard in the layers tool panel for each of them.

I've used GIMP for a number of years, and a number of features and tools, but only do a few now and then.  I never really use it enough to get proficient or retain how do things.

How can I to copy channel from one image to another image?

I have two images open. In one of them I created channels which I want to use in the second image as well.

How I do:
I select one of the created channels - Channel for selection.
From this selection I create a path - Select - To Path.
In the Paths tab, drag this created path over the thumbnail of the second image.
I open the second image, and now I reverse the operation, select the path and create a channel from that selection.

Is there another, faster and more efficient way to copy channels from one layer to another?

Thank you.

One from under the dust (tested on gimp 2.10.22 / windows 10). Easy erase cables, lines, etc....  : 

http://www.silent9.com/blog/archives/172...p-2.8.html
Original picture
   
Draw paths
   
Launch Resynthesize along a path, in gimp menu : right click on path layer, then Resynth along Path
Fil in the parameters
Width of the line to repair (= to erase object + a few pixels)
Radius to take texture from (= how much image info to take next to the object) 
   

In this PNG of 5 tally marks, the 5th one (going across) is visibly blacker & shinier than the others.  I'd like it to match the other 4, but I'm struggling to figure out what the difference is. 

Just grabbing pixels with the eye-dropper both sets seem about the same, a mix of solid black and colors that are close to black.  I thought it might be the alpha values, but I tried Layer > Transparency > Threshold Alpha and at 99% there's still a noticeable difference between the pixels that are left.

Any help greatly appreciated.

https://ibb.co/T1DRhTH