NotMyFault Posted January 22, 2023 Posted January 22, 2023 Hi, In Designer (e.g. no Filter Layers) blend range allows to use RGB (or CMYK) color information of underlying layers („destination“) to impact visibility (alpha) of the current layer. Is it possible to extend this onto the alpha channel in a non-destructive way, and not using linked layers or symbols? Background: Normally you can restrict the visibility of layers by putting them into the child position (clipping). If you have multiple layers, you could try to use groups. But nesting a layer into the groups just extends the group - clipping is not usable on groups. Compound shapes are another dead end with unwanted side effects (overwriting shape colors, not suitable for masking, ….) Quote Mac mini M1 A2348 | MBP M3 Windows 11 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 | Dell 27“ 4K 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. I use iPad screenshots and videos even in the Desktop section of the forum when I expect no relevant difference.
NotMyFault Posted January 22, 2023 Author Posted January 22, 2023 The same question from a different perspective: You can use a layer with 50% grey and blend mode "linear light". this will be invisible, unless you e.g. dodge and burn on that layer, or use noise. Works perfectly as long as alpha is 100% for all pixels. If you reduce alpha on lower levels, this will have a strong desaturation effect. Even if you correct alpha back to 100% by e.g. curves layer, all becomes very greyish, depending on level of transparency. What I'm looking for is essentially a way similar to blend mode linear light, but ignoring the layer alpha. I need the alpha channel for something unrelated. Quote Mac mini M1 A2348 | MBP M3 Windows 11 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 | Dell 27“ 4K 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. I use iPad screenshots and videos even in the Desktop section of the forum when I expect no relevant difference.
Dan C Posted March 1, 2023 Posted March 1, 2023 Hi @NotMyFault, I don't believe this is possible I'm afraid. My only thought was using Photo to create additional channels but as I'm not completely aware of what you are attempting to achieve it's tricky to say if that's appropriate. Lee Quote
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