In the end, though, we went with DDS because of the wait time for installs in Steam Workshop, and, dragging and dropping folders and stuff, is all smaller with 1/6th the file size.ĮDIT: Sorry, I got distracted typing this, and missed the main reason I was replying. Portraits don't get close or far away, but I doubt the game has a special circumstance to skip this step for them. TGA on the other hand needs to be converted to a big chunk of color data, which takes a while, considering that it is 6x larger, and this chunk of color also has to be transformed into lower resolution versions, so that far away objects don't end up looking like Every Other pixel, they look like the average of Every Two pixels (simplification)(look up downsampling).
Meanwhile, the DDS file is also 1/6th the file size of the RGB TGA, and it already comes with downsampled mipmaps, so the game doesn't have to create them on the fly for far away objects. This means the DDS files skip the game and the CPU and go straight to the GPU's inbox, and the GPU is very fast. NWN uses OpenGL and places the work of drawing the screen onto the graphics card, which also knows OpenGL. Meanwhile, DDS is far better for NWN, or rather, TGA is not good for NWN. If you don't use the shades between the 64 shades of green, however, then you haven't really lost quality, it really depends on the specific image. For Example, in DDS there are only 64 shades of green, instead of 256. DDS is much lower quality, if you have higher quality content.
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