Create Your Own Map in Crusader Kings 3! - Custom Map Tutorial

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This is how to create your own custom map in Crusader Kings 3:

1. Download Blank Map Mod https://forum.paradoxplaza.com/forum/threads/resource-almost-blank-map-or-a-total-conversion-sandbox-v1-5.1480639/
2. Change the path in the descriptor file
3. Edit the heightmap.png (either draw your own in photoshop or create one in azgaars fantasy map)
4. Export the heightmap as grayscale into your map_data folder, replacing the heightmap.png
5. Open the mapeditor, using -mapeditor as your launch option in the steam game settings
6. Repack your heightmap in the map editor for it to be shown
7. Keep on editing your heightmap/edit the visual terrain in the map editor until you are happy with it, then save it and close the editor
8. Open the provinces.png (found in map_data) with Photoshop
9. Select your landmass from the heightmap and duplicate it to the provinces.png
10. Make it one color by adding a color overlay
11. Remove all the transparent pixels, tutorial here:
• In the Layers panel, Ctrl+click (or, if on mac Cmd+click) the layer thumbnail to turn its transparency into a selection.
• Use Select Edit in Quick Mask Mode to enter Quick Mask Mode.
• Use Image Adjustments Threshold and set the Threshold to 255, to remove all transparent pixels.
• Push Ctrl+i (or if on mac Cmd + i) to inverse the mask.
• Exit Quick Mask Mode with Select Edit in Quick Mask Mode.
• Make sure the layer is selected and press Delete to remove the transparent pixels.
From https://graphicdesign.stackexchange.com/questions/105450/delete-half-transparent-pixels-in-image

12. Start painting your provinces, each with an individual RGB-color and no half transparent pixels
13. Export your file as a png to replace the provinces.png
14. Now edit the definition file (map_data) to add your provinces, using the following pattern and the RGB-colors of your provinces:
id;R;G;B;name;x;
15. Check if your provinces were added in the map editor
16. Now add your provinces to the landed_titles.txt (common folder) using the following pattern:

e_empire_tier = {
color = { 0 0 0 }
color2 = { 255 255 255 }
capital = c_county_tier

k_kingdom_tier = {
color = { 0 0 0 }
color2 = { 255 255 255 }
capital = c_county_tier

d_duchy_tier = {
color = { 0 0 0 }
color2 = { 255 255 255 }
capital = c_county_tier

c_county_tier = {
color = { 227 115 149 }
color2 = { 255 255 255 }

b_test1 = {
province = 1
}
b_test2 = {
province = 3
}
}
}
}
}

17. Create the province locators (building, player stack, combat, siege), duplicating the existing entries to add your number of provinces
Edit the map objects in the map editor using the auto-nudging tool, remember to save the game after