Jacquier Marc wrote:

> TGA  red/green is actually a 24bits image, your trick couldn't work

Yes, but the blue channel is unused when using a TGA height_field,
while a PNG can store the 16-bit in a single channel. But of course
Alain was right in pointing out that hf_gray_16 is the way to go as
it also forces gray output. Not sure what happens when you create a
height_field based on a PNG file with three channels of 16 bit each.

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