By reducing the Border width setting I can improve the accuracy of the selection. In this example, the default setting of 10% is too high because there’s a lot of fine detail that’s already selected. When you release the slider the mask snaps back with (hopefully) improved edges. If you try this with your own photos, as you adjust the slider you will see the border area temporarily displayed. It then checks in this expanded border area if it can improve the edge selection. The way the Border width slider works in Refine Selection is to expand the border around the existing selection. What you are seeing when you open the dialog is a refinement of the original selection. What most people don’t realise is that as soon as you open this dialog, Affinity Photo applies the top slider (Border width) to refine the selection. The sliders in the top section of the Refine Selection dialog attempt to improve the selection across the entire image by detecting edges. To try to fix this, we will first use the Refine Selection Tools in the dialog. Now it becomes obvious that there are a lot of white speckles (selections) in the black area that we don’t want. Having chosen the Flood Select Tool from the Tools Palette, Affinity displays its controls in the Context Sensitive Toolbar. This would require us to click on each separate area of sky, which would be exceedingly difficult. The Selection Brush Tool doesn’t have this option and instead only selects contiguous areas in an image. When we turn this off, the tool will select the areas of sky showing between the leaves of the tree. It has a “Tolerance” setting which allows us to control the sensitivity when making the selection.The reason we want to use the Flood Select Tool to create our initial selection is twofold: (If you’re unsure about the different Personas in Affinity Photo I have personas tutorial that will help.) You will find the Flood Select Tool in the Tool Palette of the Photo Persona, and it has an icon that looks like a magic wand. Instead, we could use the Affinity Photo Flood Select Tool to make the selection. Trying to select all the areas of sky in this scene would be impossible using a tool like the Selection Brush. The problem when trying to make an accurate selection like this is that there’s a lot of fine detail to deal with.
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