NotMyFault Posted October 23, 2021 Share 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 | Windows 10 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 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. Link to comment Share on other sites More sharing options...
Staff DWright Posted October 25, 2021 Staff Share Posted October 25, 2021 Thank you for the feed back I will add this to the previous one logged with our developers. Quote Link to comment Share on other sites More sharing options...
Lisbon Posted June 4, 2022 Share 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 Link to comment Share on other sites More sharing options...
NotMyFault Posted June 4, 2022 Author Share 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 | Windows 10 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 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. Link to comment Share on other sites More sharing options...
NotMyFault Posted November 8, 2023 Author Share Posted November 8, 2023 bump. still unsolved in V2.2 Quote Mac mini M1 A2348 | Windows 10 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 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. Link to comment Share on other sites More sharing options...
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