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It's terrain.bmp, you probably painted it will the hill colour instead of the forest colour :)

Exactly what I have written - I modded terrain.bmp and I used a color for forests, no mistake. Yet still it doesn't show forestst in the places that were changed.
 
Can you tell me how to mod terrain map? I want to change Galindia and Yatviagi from "Plains" to "Forest". So I paint them with forest color on terrain map, but instead of forests I get more hills there :confused:
"Forest" is not a terrain type in terrain.bmp in this game AFAIK. To have a forest somewhere, you add trees in trees.bmp. But to be sure the game will pick "forest" instead of the terrain type in terrain.bmp, just forget about both .bmp files, edit the corresponding province files in "history\provinces" and add the line

Code:
terrain = forest

to them.
 
Ha! That's the answer. I added also forest in "trees" and still had nothing, now I know realtion of map files to provinces txt files. Thanks. Funny, modding heavily history\provinces I've never noticed there is anything about terrain type. It's not how it used to be in recent PI titles.

EDIT: Hmm, looking at vanilla province history files there are no lines dedicated to terrain type at all (like "terrain = forest"). Is it a way to do this for sure?
 
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Ha! That's the answer. I added also forest in "trees" and still had nothing, now I know realtion of map files to provinces txt files. Thanks. Funny, modding heavily history\provinces I've never noticed there is anything about terrain type. It's not how it used to be in recent PI titles.

EDIT: Hmm, looking at vanilla province history files there are no lines dedicated to terrain type at all (like "terrain = forest"). Is it a way to do this for sure?
Yes it is, and yes there are :) Take a look at vanilla "33 - Faereyar.txt" for instance.