Re: x11 palette inaccuracy?

[Daniel J S. <dan...@ie...>]

On 08/31/2013 04:52 PM, Daniel J Sebald wrote:

> The snow effect appears to happen when the color of the "pixel" is
> predominantly red.  Assuming the order of the triplet is RGB with red
> being most significant, it could be that the upper-most palette is
> incorrect, the index is pointing outside the palatte, or there is some
> time of sign/unsigned issue unaccounted for, or all of the above.  I'd
> have to guess it is an end-of-palette issue because otherwise I suspect
> we'd have seen this issue show up in some other way.

I conflated a couple concepts there: RRGGBB wouldn't be a palette lookup 
sort of thing.  This is palette-based so I'm going to guess indexing 
outside the palette, i.e., some rounding effect puts the palette index 
one past the last value and a range check is missing.

The best place to watch is the colorbar.  It is always the same color 
that has the incorrect shade.

Dan