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Separate luma and color channels

PostPosted: Fri Sep 30, 2022 1:47 am
by Cesar Tejada
Hi! I want to know what nodes can I use to separate my image in two channels, in this case luminosity and color.

I want to have the flexibility to work in each channel separately. For example if I want to add blur to only the luma channel.

Any idea? :)

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Re: Separate luma and color channels

PostPosted: Fri Sep 30, 2022 11:35 am
by Hendrik Proosa
Colorspace is the node. Convert to one of numerous luma-chroma models or some HSV/HSL variant where luminance or something similar is in lightness/luminance/value component.

They all produce three channels, not two. One luminance based and two color components.

Re: Separate luma and color channels

PostPosted: Fri Sep 30, 2022 2:13 pm
by Chad Capeland
Bitmap can output just Luminance if you just want one channel and want highest performance. There's also a Fuse out there called ColorToMono that gives some more dimensionality reduction options.