Ruzeen

I set some colour samplers for my photography so I can balance the RGB channels. But I found when I zoom in and out, the values change. I suspect this is due to the size of the pink crosshair. This is a bit annoying to keep having to make a mental note of (like remembering what zoom level did I balance colours on). If this could be resolved to not change on zoom level, or a fixed 3x3, 5x5 or 7x7 average for example that would be great. Screenshots attached. Please note the RGB values in my info panel on the right and how they change on zooming out. Many thanks Ruzeen

The only way I've found to do this so far is like so Edit say your Red channel on its own instance. Then copy paste that into a new canvas. Go into "Channels". Right click "pixel gray/red" (depending on whether the canvas is RGB or grayscale). Click 'Create Spare Channel'. Name that spare channel Red. Do that for your G B channels as well. Until in your channels window you have "RGB" in your spare channels. Create a white layer. Make sure your image mode is set to RGB (Document > Assign ICC Format - RGB/16bit). Click the white layer. Go to your Channels. Right click the Red spare channel and select "load into Pixel Red", and do the same for GB. Then you'll have a RGB image from your mono images. Same applies for HSO narrowband imaging too. Hope that helps. I'll be making a tutorial soon on my astrophotography YouTube channel about doing this.

Within Select > Select Sample Colour, a dialogue pops up allowing you to tweak the tolerance of the selection. This is great, but sometimes I need to select just highlights, or shadows. I find the Select> Tonal > Highlights/Midtones/Shadows to be too hit or miss. A tolerance slider in order to refine that selection - the same way that Sample Colour has - would be excellent. Thanks

I'm not entirely sure if this already exists but I've tried it several times. I'm an astrophotographer and in my editing flow I'm often manipulating individual RGB channels, compositing and then re-inserting them in. Or just adding in totally different images to RGB channels. So far I have to make a spare channel, name it. THen make a new white layer, then go in and load that spare channel into R, G or B. I think this is a really convoluted method where as in Photoshop you could literally click the channel, and hit paste to put the photo into the channel. If this already exists and I'm doing it wrong please inform me. But otherwise I would enjoy seeing this. Thanks

I would like this also. There's a few curve presets I use for astrophotography which I would like to poll over to Affinity Photo since I've finished my transition from Photoshop to Affinity.