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In my job I work with PS retouching old book covers. In many case I work with channels and calculations (to mix channels I created).
I wanna to make the same things with AP but I can't:
In PS I do:
1) I copy a channel (example: red and rename it to "red copy").

2) I select the recently created channel, double click and can work on it in grayscale (it appears on the viewport) and I just leave a black and white version.

3) When I finish I copy another channel (example blue channel and rename it to "blue copy").

4) The same process.

5) After finishing the blue copy modifications I open the calculations dialog box.

6) I mix the "red copy" and "blue copy" and I get a new alpha channel

7) I use it to mask a zone in the original image.

How can i do the same thing with AP?
I bought the three Affinity apps and I very happy with them. I'm using the 1.7.1 version.

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You can create Greyscale layers for each colour from the Channels Panel.
1797010742_ScreenShot2019-08-10at10_05_29.png.697dc823d9a1fd2c932dba6fbd123e84.png

You just right click on each channel, red, green, blue remembering to reselect the image layer each time and you end up with this.
755223640_ScreenShot2019-08-10at10_07_20.png.2bace85089c6224cdd67b7d1942daf0e.png

Not sure if this helps but might get you a few steps further.

iMac 27" Late 2019 Fully Loaded and running Monterey 12.6.1, iMac 27" Late 2013 running Catalina 10.15.7 - Affinity Designer, Photo & Publisher V1 & V2, Adobe, Inkscape, Blender, C4D, Sketchup + more... XP-Pen Artist-22E, - iPad Pro 12.9 B|  

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9 hours ago, firstdefence said:

You can create Greyscale layers for each colour from the Channels Panel.

A macro will do this quickly & easily. Somewhere on this site, I may have uploaded one that does that but I can't find it now. :(

Affinity Photo 1.10.5, Affinity Designer 1.10.5, Affinity Publisher 1.10.5;  2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7
Affinity Photo 
1.10.5.280 & Affinity Designer 1.10.5 for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7

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