Affinity Rat Posted January 27 Posted January 27 I thought I once used the paint brush to restore 100% visibility to a selection but dont remember how I did it but believe I used the channels. Could someone please apprize me how or is it not possible. I raised this before, and using curves on the alpha channel was proposed but that seems to just “push” the alpha either expanding outside the selection or contracting within the selection, but doesnt harden edges. Quote
NotMyFault Posted January 27 Posted January 27 A bit more context would help, e.g. do you have a separate mask layer, an inherent mask of an adjustment, or a plain bitmap layer? you need white paint brush to restore visibility you can use the channels panel, choose „xyz layer alpha“, and fill to restore all areas where possible you can use a nested curves adjustment. This time drag the left node from 0 to 100% to get a flat line at 100% from left to right. 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.
lepr Posted January 27 Posted January 27 9 hours ago, Affinity Rat said: I thought I once used the paint brush to restore 100% visibility to a selection but dont remember how I did it but believe I used the channels. It's possible that you locked the colour channels and left the alpha channel editable, and then the colour of the brush would be ignored so that only its alpha would affect the alpha of the Pixel object. Quote
Affinity Rat Posted January 28 Author Posted January 28 This is the effect I was trying to achieve, maybe better way but this gives me what I wanted. Actually I wanted it to harden edges of the selection not altering the shape. Defeather.mov Quote
Affinity Rat Posted January 28 Author Posted January 28 Hardening the edge of the selection not usable either as the selection is the point where 50% transparency, so hardening including all semi-transparent pixels not acceptable, too big. Want to harden only semi-transparent pixels where transparency is <50%, so the transition between the 100% selection and the 50% transparency no so noticable. Quote
Affinity Rat Posted January 28 Author Posted January 28 This is more like what I wanted to achieve, the hard edges created using an opaque selection then expanding it to the approximate size of the other half. Quote
lepr Posted January 28 Posted January 28 36 minutes ago, Affinity Rat said: It seems what I want is not possible. It will be possible. I’ll work something out when back at the computer if nobody posts a good solution in the meantime. Quote
Affinity Rat Posted January 28 Author Posted January 28 Dont understand why the expanded opaque selection has flattened sides. Quote
NotMyFault Posted January 28 Posted January 28 ScreenRecording_01-28-2025 14-11-44_1.mov 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.
Affinity Rat Posted January 28 Author Posted January 28 @NotMyFault But how to affect only part of the selection. I was wondering if a linear gradient black to white could be applied to the alpha so the white full hard edges and black to reveal the feathered side. That might result in a smooth transition. Quote
NotMyFault Posted January 29 Posted January 29 You could use the inherent mask of the curves adjustment the area. 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 29 Posted January 29 On 1/28/2025 at 2:23 PM, Affinity Rat said: was wondering if a linear gradient black to white could be applied to the alpha so the white full hard edges and black to reveal the feathered side. That might result in a smooth transition. Don’t know how to interpret this requirement. if you start with a hard black/white edge and want to feather the transition, use a Gaussian blur filter. The feather function for selections does exactly this. This can be done for RGB color values or alpha channel. 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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