The selection applies to the tools when editing the mask.The mask is a greyscale image that can be edited with the paint tools (brush, bucket, etc.) or any color tool such as Curves, Levels, and Brightness-Contrast, but also other tools and filters (you can render plasma on it, for instance).You can switch between the two by clicking on their preview in the Layer list, or using Layer>Mask>Edit layer mask You can tell if you are editing the mask or the layer by looking as the bottom of the image window, next to the zoom indicator.White will be fully opaque, and black will be transparent. If you want full control, use the Transfer the layer's alpha channel.What is white in the mask will have the initial opacity, and black will be fully transparent. If you only want to increase the transparency of some parts initialize the mask to white.You create the layer mask with Layer>Mask>Add layer mask.Note: This method applies to the entire layer, so to apply it to a specific selection, you would need to first move the selection to its own new layer (for example, using Select > Float, then Layer > To New Layer).Īpproximately 50% transparency in the center of the circle:Īpproximately 0% transparency in the center of the circle (but still with "feathered" or "anti-aliased" edges):Ĭhanging a transparency is done by editing the layer mask. But don't add too many duplicate layers, because even after the middle area reaches complete opacity, the outside pixels will continue adding to themselves with each new duplicate layer, until they eventually become completely opaque themselves (and you will lose the "feathered" or "anti-aliased" appearance at the edges).Since the pixels around the outside edge were originally less opaque than the pixels in the middle, the outside pixels will add to themselves less than the more opaque pixels in the middle.Ĭreate additional duplicates of the original layer until the middle area reaches the desired opacity.If so, one way is to duplicate the original layer on top of itself, so that each partially transparent pixel adds to itself proportionally. You could try to retouch the glare by using the clone tool afterwards.If I understand the question, you are starting with a colored area that is partially transparent throughout, but at the outside edges it gradually becomes completely transparent (so the edges appear "feathered" or "anti-aliased") and you want to make the colored area completely opaque, except for the outside edges, which you still want to gradually become completely transparent, in the same proportion to their original transparency (to retain a similar "feathered" or "anti-aliased" appearance at the edges)? This won't preserve the glare over the white squares - since its color match the squares bellow. For the white squares, select the white color on all the image, combine with the saved-screen selection using "intersection", and color to alpha again. Save the selection to a channel Select->Save to Channel, then, select by color, use selection intersection, click on the gray area, and use color-to-alpha selecting the gray shade. Once the selection is made, the tool of choice there is colors->color to alpha. Anyway, since the screens are rectangular with no perspective, the rect-select tool is the ideal to use there. If that is too complicated to do in a single pass, since combining selections can be gone in a single wrong click, you could use the "quick mask" (edit the seletction using arbitrary painting tools by clicking on the square icon to the right of the horizontal scrolling bar on the image window). I would make a selection of all screens, using plain rectangular selection.
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