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RGB Split Channels

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11 comments

  • Brian Lawson Community moderator

    Not to my knowledge. I've wanted to go in the opposite direction, taking R, G, & B grayscale images and recombining them into a full color RGB photo and I haven't been able to figure that out either.

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  • Richard Bailey

    Thanks for replying Brian. That's a shame I thought I might be able to skip the Photoshop step.

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  • Barry Combes

    You could try a free trial of Affinity Photo, its cheaper than PS 

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  • Richard Bailey

    Hi Barry I already have Affinity Photo but I cant see how to split a file into RGB separations - in Photoshop it's really easy. It's annoying that other photo apps can't do it - or at least make it obvious how to do it.

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  • Barry Combes

    Is this what you are looking for? Extracting RGB, CMYK and LAB Channels Into Separate Layers Using Channel Mixer (in Affinity Photo) - YouTube

    There is a large number of Affinity tutorials at InAffinity on Youtube

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  • Brian Lawson Community moderator

    going to have to check that out. I don't have Affinity but I did play with different options before responding the other day and Channel Mixer is one of the filters I tried. Maybe it is transferable from Affinity to Photo RAW?

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  • Barry Combes

    I added two layers and renamed Red, Gren and Blue then added a Channel Mixer effect to each layer I also added a Curves effect to the Blue channel and then made a stamped layer

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  • Brian Lawson Community moderator

    Sweet, thanks for the update.

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  • Richard Bailey

    Barry would you mind outlining your method in more detail as I don't understand what you did. 

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  • Brian Lawson Community moderator

    Did you watch the video? Only the first few minutes are relevant to Photo RAW as it doesn't support CMYK color channels.

    For each color Layer set the Channel Mixer so only that color's channel is set to 100, set the other 2 channels to 0. Setting the Blending Mode for each Layer to Linear Dodge (Add) returns the image to its original RGB look.

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  • Barry Combes

    Richard

    As Brian outlined, with PR you can slide the relevant colour slider to 200% just play until you get the colour you want, you can add other effects to each layer as well as the channel mixer such as curves, when you are happy with the results either make an stamped layer or merge the layers

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