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I'm attempting to export an image with an alpha channel that is stacked onto the main image (in TGA), but is invisible; i.e. I don't want to export simple image transparency in this case, but rather an entirely separate alpha channel image.

The end goal is actually for a specular map, which must be attached to the main image. I suspect there's some way to do it that I'm overlooking. Does anyone have any ideas?

just select "alpha only" from the drop down box in the export panel:

in the export panel choose
format: TGA
Mode: RGBA
Alpha: PreMult.

then in the bottom part of the panel
make sure you untick 'Background'

i believe this way it should work

malcooning wrote:just select "alpha only" from the drop down box in the export panel:

tga alpha.png

?

a... sorry... now i see it, mr Ace , you want to export Only the alpha. In that case just do what Malcooning says.