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I remember seeing reported somewhere with a partial fix, but cannot find it now, so not sure if it was reported as a bug or discussed as an issue on the forum, but reporting (again?), as still present in production and beta: Expected behaviour: When adjusting levels sliders in individual RGB or CMYK channels, holding ALT while dragging should show clipping. What actually happens: No clipping is displayed. This works fine in Master. Partial fix: In Master, set black level to non-zero value, 0.001 works. Set white level to 99.999%. Go into any channel now: slide white level or black level sliders while holding ALT. Clipping is now displayed as expected.

When using a levels adjustment layer, holding alt while using the white or black level sliders show where the image is clipping. When adjusting a specific color channel, how can you show where that channel is clipping with the overlay?

I am using 1.10.4 on iMAC Catalina. The level help page seems to imply that realtime clipping preview works on any channel as per the below snippet. What I found was that it doesn't work, say on any of the R, G, B channels, unless first a level was modified on the Master. This is repeatable and explains why some you tubers first level Master, then the individual channels so that realtime clipping preview works. Having said that, the actual level adjustment does change if first doing a R, G, or B, just the realtime clipping preview does not seem to work -> confusion. Settings The following settings can be adjusted: Select a color mode from the first pop-up menu. Specify a single color channel to apply the adjustment to, including the layer's alpha channel. Master (the default choice) applies the adjustment to all channels. Select from the second pop-up menu. Black Level—determines the range of pixels in the image considered to be pure black. Drag the slider to the right to include pixels in the range (thereby increasing shadows), drag to the left to exclude pixels (thereby reducing shadows). White Level—determines the range of pixels in the image considered to be pure white. Drag the slider to the left to include pixels in the range (thereby increasing highlights), drag to the right to exclude pixels (thereby reducing highlights). Gamma—determines the distribution of mid-tone pixels in the image. Enter a gamma value or drag the slider to the left to redistribute pixels towards the black point, drag to the right to redistribute towards the white point. Output Black Level—remaps the output level of absolute black. Moving the slider to the right makes the image look more pale and washed out. Output White Level—remaps the output level of absolute white. Moving the slider to the left lessens the intensity of highlights in the image. To create a negative-style (inverted) image, position the Black Level slider further to the right than the White Level. Holding the whilst modifying the Black Level or White Level provides a realtime clipping preview.

Hi, I'm rather new to Affinity Photoshop- I'm not amazingly experienced in Adobe Photoshop, but I'm way more familiar with that.... I recently began shooting color negative film and dislike the color correction in my scanners software and the Vuescan software and wanted to learn how to do it myself in photoshop. I found a tutorial online, however, I cannot figure out how to do the "Levels Clipping Mask," ...here is the tutorial: https://petapixel.com/2017/02/01/edit-color-film-negatives-photoshop/ Basically, I know from the Affinity help page that I can press the "alt" key when I'm adjusting the Black and White levels when I'm in specific colors such as red or blue, but it just turns my image either all black or all white, and I'm not sure how to make it actually work like it's supposed to? It seems to do the job when I do it on the Master for the RGB levels, but not any specific color? Am I doing something wrong? I hope this makes sense! Thanks! -Jenny

I’m quite close to stop using Adobe, but I’m still struggling with one thing I can’t find. As a analog photographer, I scan my negatives always as positive. My workflow on Mac - I use a curve to make the image positive. - Levels, for each color (RGB) I use the alt key to drag the sliders toward the point where the history just before complete black or white. In photoshop you can see this visible. This does not seems to work in Affinity ... or am I missing this. So is there a way to do this. Thank you

Hello everyone! Today I gave another try to Affinity Photo. There has been some updates.. Shortcuts still does not work properly.. ok. let's wait. A basic function we use everyday in PS is the level layer. We use the clipping (in PS, pressing alt on Mac) to precisely set the value for each channel. It does not seem to work on Affinity.. Also you can not change channel using cmd-2, cmd-3.. like on PS. Any chance it will be implemented ? Regarda