NotMyFault Posted October 23, 2021 Posted October 23, 2021 (edited) Hi, when adding an add noise live filter, nest it into a group, placed atop a layer with partial transparency, it impacts the alpha channel in a unpredictable and unwanted way. The resulting alpha is expected to be constant 0,75 / 191 after layer blending for all pixels. The observed alpha value is scattered around 191, from 172 to 212. Mitght be related to my other post, might be a new issue. add noise alpha bug.afphoto Here a chart what would be expected (alpha mapped to blue channel to make it visible in Histogram) Edited October 23, 2021 by NotMyFault added histograms 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.
Staff DWright Posted October 25, 2021 Staff Posted October 25, 2021 Thank you for the feed back I will add this to the previous one logged with our developers. Quote
Lisbon Posted June 4, 2022 Posted June 4, 2022 I ran into a problem that I believe is related. I start with a live noise filter (100% intensity) and a pixel layer filled with black. At this point everything is fine. But after grouping, the composite alpha is also affected by the noise live filter. If i make the noise live filter as a child, everything goes back to normal and the composite alpha is no longer affected. Old Bruce 1 Quote
NotMyFault Posted June 4, 2022 Author Posted June 4, 2022 1 hour ago, Lisbon said: I ran into a problem that I believe is related. I start with a live noise filter (100% intensity) and a pixel layer filled with black. At this point everything is fine. But after grouping, the composite alpha is also affected by the noise live filter. If i make the noise live filter as a child, everything goes back to normal and the composite alpha is no longer affected. This is kind of consequent by Affinity: Filters nested affect RGB (or CMYK / G) layers only, but exclude alpga Filters at masking position affect RGB and A channel. For noise, this does not make sense. The best solution would be Affinity allows to select for every live filter which channel gets affected (independent from nested / masking position), similar to channels panel for destructive filters. Affecting alpha channels does not do any harm (or is even intended) in case of blur filters, but it is 99% unwanted for noise filters. Oversight in design of filters. Maybe by design, but non reasonable design. Lisbon 1 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 November 8, 2023 Author Posted November 8, 2023 bump. still unsolved in V2.2 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.
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