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As you've mentioned Publisher: If you own Photo, you can use the Photo Persona in Publisher to get that function.

Similarly, except when you need the Export Persona, you can use Publisher's Designer Persona, and switch to the Photo Persona when you need Channels.

Thus, they're not exactly "in" Publisher & Designer, but only a click away :) 

Perhaps that helps?

-- Walt

Desktop:  Windows 11 Home, version 21H2 (22000.613) 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 
Laptop:  Windows 10 Home, version 21H2 (19044.1706) 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU.
        Affinity Photo 1.10.5 (.1342) and 2.0.0 / Affinity Designer 1.10.5 (.1342)  and 2.0.0 / Affinity Publisher 1.10.5 (.1342)  and 2.0.0
iPad Pro M1, 12.9", iPadOS 16.1, Apple Pencil 2, Magic Keyboard

      Affinity Photo 1.10.5 (.280) and 2.0.2 / Affinity Designer 1.10.5 (.21) and 2.0.2 / Affinity Publisher 2.0.2

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9 minutes ago, walt.farrell said:

As you've mentioned Publisher: If you own Photo, you can use the Photo Persona in Publisher to get that function.

Similarly, except when you need the Export Persona, you can use Publisher's Designer Persona, and switch to the Photo Persona when you need Channels.

Thus, they're not exactly "in" Publisher & Designer, but only a click away :) 

Perhaps that helps?

Found it, thanks. But what if someone have publisher only?

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Then they don't have it available. 

You've made a reasonable request; I was just pointing out that you have an alternative, while waiting for it to be satisfied.

-- Walt

Desktop:  Windows 11 Home, version 21H2 (22000.613) 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 
Laptop:  Windows 10 Home, version 21H2 (19044.1706) 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU.
        Affinity Photo 1.10.5 (.1342) and 2.0.0 / Affinity Designer 1.10.5 (.1342)  and 2.0.0 / Affinity Publisher 1.10.5 (.1342)  and 2.0.0
iPad Pro M1, 12.9", iPadOS 16.1, Apple Pencil 2, Magic Keyboard

      Affinity Photo 1.10.5 (.280) and 2.0.2 / Affinity Designer 1.10.5 (.21) and 2.0.2 / Affinity Publisher 2.0.2

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Posted (edited)

You can use a set of 4 adjustments (channels mixer, levels, or curves will do) and set them to show only one of the color channels, and output 0 for all others.

Channels mixer is the most versatile, as it allows to map one selected channel into all color channels or K to get a greyscale preview.

Edit: 

please find a file with those adjustment layers below. I’ve checked the effect in Photo and compared to what channels panel will show, seems identical.

Activate only one of them at a time.

The file contains a test image. Please do not use it elsewhere.

cmyk channel panel.afdesign

Edited by NotMyFault

Mac mini M1 A2348

LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5

iPad Air Gen 5 (2022) A2589

Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps.

 

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