medoli900 wrote:
I would have change the color of the green slime on Edea, but i don't know if there is a color changing tool in gimp and i didn't want to do it manually.
I can't believe I'm doing this for an Entei edit, but… I hate to see people who think in numbers presented with the artist's approach to graphics. Let me introduce you to shatterwork! (With instructions specifically for GIMP, since that's what I have too.)
Note that there's nothing else green in that panel. Conceptually what you want is to operate on the stuff where there's more green than anything else, and in proportion.
First, shatter the image into its RGB channels; in GIMP this is Colors | Components | Decompose… and pick RGB or RGBA. Uncheck layers and it's easier to think about, check layers and it's quicker to do.
Then, use Lighten Only to combine red and blue(merge the layers), and Subtract this from green(merge again). Then grab the rectangle tool and black out the other panels.
Now you have a 1-channel image of "the greenness of panel 3". There's a couple things you can do with this:
A) Copy/paste one layer of it over the original, change the right bar from Layers to Channels, right-click on any channel and pick Channel To Selection. Switch back to Layers, right-click | Delete Layer to get rid of the greenness layer. Hit Del a few times to punch through the image, then add a layer underneath and draw on that.
B) Copy/paste two layers of it over the original, set the lower to Subtract and the upper to Addition. Go into Colors | Levels… and zero out the red and blue of the lower, and maybe crank up the green so it subtracts a lot. Then on the upper use Colors | Levels… to get a color change, which you can see live, or use Multiply to combine something else with it.
There's actually a bunch more things you can do with it, but most of them go through Colors | Components | Compose…, which isn't real useful for this task. (Another trick is you can darken the red/blue layer before subtracting it from green, in order to get places that are greener than the rest but not that green.)