Sub-pixel positioning

Boudewijn Rempt boud at
Wed Mar 17 20:22:42 CET 2004

On Wednesday 17 March 2004 20:12, kde at wrote:

> So if I get this right, does this mean that compositing of multiple layers
> will happen _only_ in the RGBA colour space? This could cause serious
> problems in the future. Imagine someone compositing 10 layers of CMYK(A)
> with 32bits for each channel. If combined in 8bit per channel RGBA, I can
> imagine that the resulting composition would be of questionable quality.
> On the other hand, if this means that layers are only rendered to RGBA at
> runtime, while compositing the layers in their native colourspace for
> exporting the image, this would be no real problem. It would still require
> investigating and implementing the various compositing functions for those
> colourspaces.

Yes, that was my idea -- and Adrian's refinement. If there are layers of 
different types in an image, composite them for display purposes in rgba 
(since you have to render everthing to rgb anyway to display on a monitor), 
if all layers are of the same type, composite natively.

Boudewijn Rempt |

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