Biomes from terrain

[DcNdrew]

Hi!
First: sorry for my English.

Second: I made a terrain map with THIS, and I'd like to make biome map to Minecraft – Open Terrain Generator mod. This heightmap won't be accurate when OTG will regenerate the biomes, but it isn't problem yet. I'd like to make climate zones and I can change the colors of the biomes.
I thought I can make colored stripes and someway they will change the colors of the terrain, but I'm not sure what would be the best way. And of course I'd like to make less colors to work with them easier.

Do you know any tutorial? I'll try by my own, but I asked if you can help me.
Thank you!

[rich2005]

(05-16-2017, 03:28 PM)DcNdrew Wrote: ....I made a terrain map with THIS,  I'd like to make climate zones and I can change the colors of the biomes.
I thought I can make colored stripes and someway they will change the colors of the terrain, but I'm not sure what would be the best way.

Welcome to gimp-forum.net

It would help if you could post an example map and some indication of expected result.

It might be straight forward, this example is a simple layer over the top in desaturate mode to give an impression of 'cold' at the poles.
This is the manual page, https://docs.gimp.org/en/gimp-concepts-layer-modes.html gets a bit technical.

   

You could experiment with different colours and layer modes to get different effects. Or you might need some more complex editing.

Quote:And of course I'd like to make less colors to work with them easier.
Do you know any tutorial? I'll try by my own, but I asked if you can help me.

Reducing the colours will again partially depend on the type of map. One of the Gimp color filters is posterize which might do it, or there are several other ways, depends what is required.

There is one site dedicated to producing maps for games etc. see: https://www.cartographersguild.com might be some tutorials there.

[DcNdrew]

Thank you very much!

[DcNdrew]

One more question:
Is there a way to find that how many colors are used on the image?

[Ofnuts]

(05-17-2017, 06:42 AM)DcNdrew Wrote: One more question:
Is there a way to find that how many colors are used on the image?

Colors>Info>Color cube analysys

[rich2005]

(05-16-2017, 03:28 PM)DcNdrew Wrote: ....And of course I'd like to make less colors to work with them easier....

You can use Colors -> Info -> Colorcube Analysis 
lots of screenshots so not inline  http://i.imgur.com/nEKI3WZ.jpg

That is straight from the site you referenced - 56 colours although there are options on that site for different color schemes.

Looking at your request on how to reduce the number of colors.

1. Posterize sort of works.
Give the image a small gaussian blur Filters -> Blur -> Gaussian Blur

Apply Colors -> Posterize can get you down to 16 colors, depending on original image. http://i.imgur.com/WITxBqT.jpg

2. An alternative is 
Apply a gaussian blur

Convert the image from RGB mode to Indexed mode. Image -> Mode -> Indexed http://i.imgur.com/JauAZf5.jpg with a small number of colors (using 8) here.

That gives an image with a color map Windows -> Dockable Dialogs -> Colormap that looks like this http://i.imgur.com/fnGUVIz.jpg (7 colors + white)

The colormap can be edited to further reduce colors, the sea for example http://i.imgur.com/2iRp1Dk.jpg

Set the image back to RGB mode Image -> Mode -> RGB and a check gives 6 colours. http://i.imgur.com/jU8amzS.jpg

[rich2005]

Back to reducing the number of colours.

Seach enough and there is often a Gimp script/plugin to implement a procedure.

This one which uses the index method but returns the image to RGB mode.

I found the discussion for the script here, it was originally from gimpusers.com:
http://gimp.1065349.n5.nabble.com/Reduce...d8887.html

In use, same image as before, looks like: 



The script is attached, if you want to try it, un-zip, copy to your Gimp profile
In windows C:\Users\your-name\.gimp-2.8\scripts
In linux ~/.gimp-2.8/scripts
Only given it a very brief try, it is old, 2008, bound to be some snags.
I still advice a small gaussian blur before (depending on image)