[PD] Pix_levels explanation and Screen Effect for Gem

[Alexandre Quessy]

On 4/5/06, IOhannes m zmoelnig <zmoelnig at iem.at> wrote:
> if you want to just remove all the greens and reds in the video, why not
> texture it on something that has no red/green components (like a
> [square] with [color 0 0 1])  - default texturing does a per-channel
> multiplication with the underlying color (so if the the channel "red" is
> zero for the geo, than the you won't have any red-component in the
> displayed image either)
> if you want to burn CPU-cycles, you could also use [pix_gain] and set
> the gains to "0 0 1"

This is very efficient on CPU. But, if one needs to add saturation or
contrast in Gem, he needs to use [pix_levels] or [pix_gain] for
saturation and [pix_curve] for contrast, right ?

aalex