jdiamond Posted September 20, 2016 Posted September 20, 2016 I work with png files with transparency. Currently, the only way I know to make an image with transparent edges is to select part of a non-transparent image, cut it out, and paste it in a new image. But once it's there, I cannot make more parts of it transparent. Is there a way to use normal drawing tools to edit the alpha channel of an image? (This is not the same as drawing with transparency, as that only affects the SOURCE alpha, not the destination (background) alpha). What I'd like to do is be able to directly change the background's alpha layer and paint "transparency" onto an image. I've tried drawing with only the alpha channel visible, but it didn't work. Any advice is appreciated. Great job on Affinity Photo - I love the updates. - Jeff Quote
Staff Lee D Posted September 20, 2016 Staff Posted September 20, 2016 Hi jdiamond, You can apply transparency using different methods, ones I've used in the past are: 1, Using the Selection brush, selected your area, and hit delete, this will simply remove the selected area. 2, Again using the Selection Brush or Quick Mask option, create your area, then click Refine on the toolbar. Now you can refine the selection if required, Using the Selection menu you can choose to create a Mask or a new Mask Layer. 3, You can also simply use the Erase Brush Tool, changing the opacity, flow and hardness of the brush. Quote
gw_westdale Posted August 13, 2021 Posted August 13, 2021 Thanks that is helpful -- the eraser is pretty useless being circular - perhaps the eraser should be allowed to have brush shapes ( or the normal brush should pick up a colour of transparent ) Noted that this needs the shapes etc to be rasterised. (I'd dearly love a vector eraser in Designer - but that is another story) Quote Win 11 PCs 64bit Envy and Envy tablet + Filter Forge Retired computer systems tester doing graphics for charities and politics etc.
Ron P. Posted August 13, 2021 Posted August 13, 2021 5 minutes ago, gw_westdale said: Thanks that is helpful -- the eraser is pretty useless being circular - perhaps the eraser should be allowed to have brush shapes ( or the normal brush should pick up a colour of transparent ) You can use other brush shapes. Click on the More button in the context menu, and in the dialog window that opens you can alter the shape, rotation, size, flow, spacing, ect. Quote Affinity Photo 2.5..; Affinity Designer 2.5..; Affinity Publisher 2.5..; Affinity2 Beta versions. Affinity Photo,Designer 1.10.6.1605 Win10 Home Version:21H2, Build: 19044.1766: Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz, 3301 Mhz, 6 Core(s), 12 Logical Processor(s);32GB Ram, Nvidia GTX 3070, 3-Internal HDD (1 Crucial MX5000 1TB, 1-Crucial MX5000 500GB, 1-WD 1 TB), 4 External HDD
walt.farrell Posted August 13, 2021 Posted August 13, 2021 1 hour ago, gw_westdale said: perhaps the eraser should be allowed to have brush shapes If you look carefully at the tooltip text when you hover over the Eraser icon you should see that it says Eraser Brush Tool. It is a brush, and you can choose any of your brushes for it, using the Brushes panel. Quote -- Walt Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases PC: Desktop: Windows 11 Pro 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 Laptop: Windows 11 Pro 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU. Laptop 2: Windows 11 Pro 24H2, 16GB memory, Snapdragon(R) X Elite - X1E80100 - Qualcomm(R) Oryon(TM) 12 Core CPU 4.01 GHz, Qualcomm(R) Adreno(TM) X1-85 GPU iPad: iPad Pro M1, 12.9": iPadOS 18.3, Apple Pencil 2, Magic Keyboard Mac: 2023 M2 MacBook Air 15", 16GB memory, macOS Sequoia 15.0.1
R C-R Posted August 13, 2021 Posted August 13, 2021 6 hours ago, walt.farrell said: If you look carefully at the tooltip text when you hover over the Eraser icon you should see that it says Eraser Brush Tool. Another clue that it is a brush based tool is among the options in the context toolbar there is a "More" button that if clicked opens the Brush - Selection window. This allows you to change the brush's characteristics without changing any of the brush presets in the Brushes panel. You also get the symmetry options characteristic of brushes. Quote All 3 1.10.8, & all 3 V2.5.7 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7 All 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7
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