![]() ![]() ![]() You can now click inside the selection to fill it with the foreground color (black). I am going to use the Rectangle Select tool to select roughly the top third of the image, and I’ll fill this selection with black. To illustrate how masks can affect its layers transparency, let’s paint! Modifying a Layers Transparency with the Mask ¶Īt this point any operations performed on the canvas will apply to the mask and not to any layers themselves. It is also active (there is a white border around the thumbnail in the dialog, but is not visible due to the mask being white as well) and ready for modification. The layer mask has now been added to the “Teal” layer. Layers dialog with mask applied to Teal layer. You should notice a change in your Layers dialog now that shows the layer mask thumbnail to the right of the layer it applies to (in this case the “Teal” layer): The option to initialize to Black shows that the mask will make the entire layer fully transparent.įor the purposes of this tutorial, we will let the mask initialize to White (full opacity). Notice that the first option is to set the entire mask to White, which will result in full opacity on the layer (no transparency from the mask). There are many options for initializing the Layer Mask. ![]() This will then bring up the “ Add a Mask to the Layer” dialog with some options: You can also add a layer mask through the menus: Right-Click on the layer you want to add a mask to (the “Teal” layer in my example), and the Context menu will show an option to Add Layer Mask…: The teal layer is the active layer (look for the white border), and the one which we will add a layer mask to. There is a base image at the bottom of the stack, and a single layer of teal over it. The process for adding them is simple.įor this example I will use a simple image with only two layers, as shown above. Layer masks need to be added to a layer before they can be used. This flexibility to define the opacity of different areas of a layer is the basis for more interesting image manipulation techniques such as selective coloring and luminosity masking. This modification of a layer’s transparency through a mask is non-destructive to the layer itself. This differs from the use of the layer Opacity slider as a mask has the ability to selectively modify the opacity of different areas across a single layer. They allow you to selectively modify the opacity (transparency) of the layer they belong to. I also did a border select on the original border select (after filling in layer mask) to blur the edges of my new border, and not the whole border.Įxample using black layer instead of image, and rounded corners.Layer masks are a fundamental tool in image manipulations. Using this image as the main layer, I created a thick blurred border, but started with a circle selection instead of a square. ![]() Everything that is black on the layer mask will be transparent to the layer below. That will give you a blurred border, using whatever image is on the layer. Select all on layer mask, and gaussian blur a bit. fill a layer with any colour, pattern, gradient, image etc., and use the selection to create a black box in a white layer mask using the same selection. if you use 5 for Border's input value, you will have a 10 px wide border selected. This selects around your current selection's outline (dotted animated line), at a distance of however many pixels you enter in the dialog box on either side of original line. Use the box select tool, then Select > Border ![]()
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