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I'm not sure if it's the right place to this topic, so if it's not - I apologise.


Sometimes I want to check on photo what is the pure white and what is pure black, and when I tried to do this in  AP using threshold, I could only check the black parts. When I set 100% value in threshold it shows like there is no white on picture. Should it be that way?







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The Threshold adjustment isn't a checking tool, it's an adjustment: when you use it, you're changing the pixel content of the image (so when you set the value to 100% you aren't showing that there's no white, you're changing the picture to one where there is no white).

Alfred online2long.gif
Affinity Designer/Photo/Publisher • Windows 10 Home (4th gen Core i3 CPU)
Affinity Photo for iPad • Designer for iPad • iOS 12.4.1 (iPad Air 2)

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If you just want to check on what is pure black or white, use the levels adjustment, set to grays, and move the sliders so that black or white are just 1% apart at either end. 

iMac 27" Retina, c. 2015: OS X 10.11.5: 3.3 GHz I c-5: 32 Gb,  AMD Radeon R9 M290 2048 Mb

iPad 12.9" Retina, iOS 10, 512 Gb, Apple pencil

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