Hello, I am trying to apply a difference clouds effect to a specific section of green on my canvas. Right now I'm following a tutorial on Teardown's heightmaps, and they use a difference clouds effect to give the grass layer some texture:
https://youtu.be/aQviv2BuP2c?t=351
This link is timestamped to 5:51, where he uses this effect.
Unfortunately, this tutorial was done in photoshop, and so I can't follow along very easily. I've looked at other forum posts, youtube videos, talked to friends, and I just can't figure out how to use this effect. One source said that the way to do this is to use a solid noise filter on a layer whose mode is set to Difference. This was my best lead, but it turned all the grass pink, and I'm not sure why. 
So to be more clear, I'm asking if there is a way to achieve this effect or something similar in gimp. The grass layer must maintain a red and blue value of 0, or else it will interfere with other aspects of the heightmap. Linked is my current project, so that you can have a better idea of what I'm trying to do.

i used to do this all the time now when i remove the background it inserts a colour background in this case its orange as was lasted used.
of course i have added a alpha channel.

i am going crazy, please help

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Hunting for an old printer cable, found an envelope packed full of 3.5" / 5.25" / compact cassette / VHS adhesive labels...examples and an old 5.25" FD as  background  

   

What are you hoarding ?

It used to be that when I used the move tool and had it set to "pick a layer or guide" the layer I pick would become the active layer.
Now when I do that it reverts the active layer back to what it was before I moved anything.

Okay, I can see how people might prefer it to work that way.  But its driving me up the wall because that's not the behavior I'm expecting.
How do I switch it back so that "pick a layer" will change the currently-selected layer to whatever layer I click?  Where is the option to make that tool work the way it used to?

I have an application that requires combining multiple layers all with single color elements on transparency. This worked fine the first time I tried it but now at the borders the pixel colors are being changed. For example where a black edge met a red/blue surface some pixels have now changed from 7f007f to 7c007c. This is a total disaster for my application. Why is this happening and how do I prevent it? I have checked the process at every step. I have selected and deleted all the transparent areas and confirmed that it included the pixel in question. I have checked the pixel before the merge and after the merge and it is altered after the merge. Any suggestions are appreciated. I hate to dig out my ancient copy of PaintShopPro to do such a trivial task. This is not rocket science and should be a simple process.

I am checking the pixel color with the color picker tool before and after the merge. It only affects a few pixels at the edges of the overlay but even one pixel being changed invalidates the image. I get the same result exporting the image to a single layer format (.bmp)

While the colour to alpha tool is very useful to get rid of backgrounds, it also makes the image semi-transparent. Is there anything we can do ?

For eg, if we try to erase the background, it makes the image transparent. I also tried the Erase Background plugin. But it was leaving traces.

Hello, I am a novice GIMP user.  I am modifying game textures, which usually include a mask texture, with various red, green, or blue colors.  Those are used by the game engine to color specific parts of a texture to customize it.  I was manually editing parts by hand, which is not accurate, and someone showed me the short video in PS below.  I don't really understand it, but maybe someone can watch it, and can show me how to achieve the same thing in GIMP with step by step instructions?  Thanks in advance, it will save me a lot of time.

http://i.imgur.com/nSY6Gu9.gifv


I'm sure the same effect can easily be accomplished in GIMP, and I can provide the files he is using if necessary, I just don't really have a good workflow.  Specifically, the goal is to easily, quickly, and accurately make a part of the COLOR texture (from a color or section on the MASK texture) be colored with a specific color, like with colorize or colorify, and the MASK texture to have the corresponding part be black.  I am just not getting a lot of the exact detail when I do it manually.

Hi guys, im trying to edit a number of images all at once.... the images are of faces with plain coloured backgrounds.

i have been using the batch image manipulation tool for bucket fill to change the colours of the image background .... which works great. i can do 100's at once which takes minutes....

but not i want to do the same thing, but using 2 colours and the gradient tool.

i can do this manually one at a time, step by step: 

open the image >
choose the fuzzy select tool >
click and select the background area of the image >
choose the gradient tool >
then with the gradient tool, i will select the x and y points of my gradient on to the image> 

once the gradient has successfully coloured the background i will then click to export the image, and save it as a png file in to my new folder location


sorry if this has been discussed before, 

I have added a before and after example

thanks for your time.

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Hello, I am making a heightmap for the game Teardown, and I am new to complex editors like gimp entirely. 

The port (the section with uniform color) and the ground above the port, shown as a brighter red, are on different layers. I need to select the area within the port, minus the area covered by lighter shades of red. If it's helpful, the reason I need to select this particular section is because I want to add a specific shade of blue on top of this section on a new layer.
The preview isn't showing the image, so in case it doesn't work, I will also link the image below. Thanks for any help!

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What I'm trying to do is overlay a stack of layers on top of another stack, keeping the order of the layers.

Something like I tried to demonstrate in the image below, where the stack of Image 02 is on top of the stack of Image 01.

I tried to use the Plug-in Interleave layers, but the interleaving between the layers occurs (alternating layers of Image 01 with those of Image 02).

I tried:
A - Export the layers of Image 02;
B - Open as layers, inside Image 01.

But in this case there is an inversion in the order of the layers of Image 02:
Instead of coming in order (from top to bottom) A00, A01, ..., A50, it comes as A50, ...,A01, A00.

I thought of using the Layer - Stack - Reverse Layer Order option, but in this case all the layers of the image are inverted and not just the layers of Image 02 (which are inverted by this process).

In short, what would be the way to obtain the result of Image 03

Thx!