Niklas Haas 702a5ac29b avcodec/exr: set correct alpha mode ...

OpenEXR always uses premultiplied alpha, as per the spec.

cf. https://openexr.com/en/latest/TechnicalIntroduction.html

> By convention, all color channels are premultiplied by alpha, so that
> `foreground + (1-alpha) x background` performs a correct “over” operation.
> (See Premultiplied vs. Un-Premultiplied Color Channels)
>
> In the visual effects industry premultiplied color channels are the norm,
> and application software packages typically use internal image
> representations that are also premultiplied.

2025-09-02 17:06:25 +02:00

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