On 3 Jun 1998 15:25:32 GMT, "Robert Dawson" <Rob### [at] stmarysca>
wrote:

>	The patch is obvious - just convert all three channels to their average
>just between ray tracing and pixel storage, and add the keyword & an extra
>field in the camera description. If I had a few hours to spend...

Try using hf_gray_16 (section 7.8.4 in the manual) and rendering to a
PNG image.  If you render to TGA, you'll get the familiar reds,
greens, and yellows, but if you render to PNG it's saved as a 16-bit
grayscale file.  This uses a weighted average that more closely
approximates the actual gray value, as well.

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