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GLSL texture.rgb showing up as black

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When I use only the .xyz or .rgb part of the texel, the PNG transparent image is showing up as black. Why? When I use all 4 components it shows up correctly though.

 

I'm saving the alpha channel for bump information for heightmap texture blending. I saved the transparent PNG as a JPG and the .xyz component shows up fine.

 

I'm using a Quadro card.

Edited by polyfrag

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