Using GPU to rasterize image with 128 color channels

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I need to rasterize a multispectral image, where each pixel contains the intensity (8 bits) at 128 different wavelengths, for a total of 1024 bits/pixel.

Currently I am using OpenGL, and rasterizing in 43 passes, each producing an image with 3 of the 128 channels, but this is too slow.

Is it possible to do it in a single pass by somehow telling the GPU to rasterize a 128 color component image (not necessarily using OpenGL)?

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