Color a greyscale images using a gradient

Unity Engine
1

I’m working on a script that randomally generates a greyscale image. What i want is something similar to what is found on this page http://libnoise.sourceforge.net/tutorials/tutorial3.html ,in the middle of the page. So i want to somehow apply a premade gradient to each color value in each pixel. I have my gradient set up as a Texture2D.

I hope you understand what i’m trying to do.

What would be the best way to achieve this?

2

You would have to have a gradient 1 pixel wide and 256 pixel’s tall.

get both textures into a color array:

read each pixel in your height map and replace it with a pixel that many bytes into the second array.

for(var i=0; i<heightmapColors.Length; i++){
heightmapColors[i]=gradientColors[heightmapColors[i].r];
}

Apply it back to teh texture:

and appy your changes

Just in case you need more info.

3

Thanks, this was exactly what i was looking for. I will give it a try

4

I’m a bit stuck now, i have done what you put in the code window, and i’ve tried applying and saving but all i get is a blank texture.
Can you give me some directions on how the whole apply thing would work?

I don’t know if this is the problem, but Unity wont let me create a texture 1pixel wide (or tall) it gets resized to 256x2. I guess that is because of the “Non Power of 2” which is greyed out for me.

5

Solved to with help from UnityAnswers, for those interested i’ve posted my functioning script there:
HERE