Allow color inputs in merge transparency #1888
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Merge Transparency now allows color inputs.
I also switched to
as_target_channelsto convert the input RGB channels to RGB. This drops support for 2-channel images, but no node produces any right now anyway, so that's not a huge loss. If we decide to properly support 2-channel images in the future, we will add support for them toas_target_channelsanyway, since this function is used everywhere.