Bitmap OUTput <needs help!>

Hello. I need information about Bitmap Output.

I'm trying to make multi-level loop carpet from Rhinoceros-grasshopper data.

however, the carpet tufting machine only accepts  bitmap, heat map like data.

(like attached file)Untitled-2.jpg

So I need to convert  height matrix to heat map (bitmap) data.

Does anyone know the hints how to output bitmap data from Grasshopper?

Or Do I need to make custom script or something ?

Sorry for my poor english, Please help me.