How to create transparent building textures?

I’m trying to remove the surgical tools from Mercenary Camps, but when I make changes it adds a coloured background where the original was transparent (around the edge of the tablecloth and tools set on the table).

Does anyone know how to get rid of this? The .tga files seem to preserve the proper transparent alpha layer. Is it an issue with converting to .ddt?


For reference, the original is on the left, and what I’m trying to add is on the right (making the background black doesn’t help).

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Que programa utilizas para editar las texturas? Lo unico que tienes que haces es guardar una seleccion del canal alfa

I am using Gimp for this and as far as I’m aware, it does have an alpha channel. If there’s anything special I need to do when exporting, I’d love to know.


I’ve even made unit skins before with transparent sections, so I’m at a loss for why it isn’t working now. I think it might be an issue with exporting from .tga to .ddt but I’m not really sure how to fix that.

Maybe I need to change the 4 numbers in the .tga file name before converting?
https://www.reddit.com/r/aoe3/comments/10nqnh4/how_do_you_convert_a_tga_file_to_a_ddt_file/

Turns out this was the issue. I copied the numbers from the “west shelter” (base model of Field Hospitals) and it worked. This is the file name I used:

merc_camp2_mata_BaseColor.(0,4,9,10).tga

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