// set of RGB primaries; you would currently not get YCbCr
// or something similar).
//
- // Again, most effects will want this.
+ // Again, most effects will want this, but you can set it to false
+ // if you process each channel independently, equally _and_
+ // in a linear fashion.
virtual bool needs_srgb_primaries() const { return true; }
// Whether this effect expects its input to come directly from