If you want to remove pixels from an image, it’s better to hide them than to delete them. In other words, don’t destroy your original pixel data! If you’re not familiar with the term, it’s actually pretty simple: image data should be altered dynamically instead of permanently. Why You Should Use Masks in GIMPĪlong with general pixel layers and adjustment layers, masking is a key element of a non-destructive editing workflow. I find GIMP’s handling of this aspect to be a bit of a drawback, but I’ll show you some simple ways around the problem later on in the tutorial. The mask itself isn’t visible in the final image, but it can be displayed temporarily while working within GIMP to give you an idea of which areas are masked and which aren’t. Various shades of gray allow the creation of partially transparent areas, depending on how light or dark the gray tones are. If you paint white pixels on a layer mask, the corresponding area of the standard pixel layer becomes visible, while painting black pixels makes the corresponding area transparent. Technically, it works by modifying the layer’s alpha channel, which controls the transparency of the layer. I’ll also include a couple of handy tips for making the masking process much easier! How Does Masking Work?Ī mask is a kind of invisible secondary layer that sits over the top of a standard pixel layer, controlling which areas of the underlying pixel layer are visible. But if you’re new to the world of masking and you want to understand how they work in more detail, then read on. If you’ve already used masking in a different editing program, that’s probably all you need to get going on your project in GIMP. Step 3: Click the layer mask thumbnail in the Layers panel to make it active, and use the Paintbrush tool to paint black and/or white pixels on your layer mask.Step 2: Set the Initialize the Layer Mask option to White (Full opacity).Step 1: In the Layers panel, right-click the layer you want to mask and choose Add Layer Mask.Here’s how to create a basic layer mask in GIMP: Alternative Masking With Quick Mask Mode.I wanted to create a interesting, surreal image of water motion that looks fairly normal, but upon close inspection, doesn’t seem quite natural (the water is both stopped and moving fast at the same time). The final result is close enough to the effect I wanted, though I could have spent more time on taking more pictures and editing. The assignment was to take 4 pictures of where all pictures have something in common, but with one variation of the camera parameters – (in this case, only shutter speed was varied). This tutorial resulted from an “Epsilon Photography” assignment in my Computational Photography class. The final image ( after using Topaz Adjust, of course!)… Releasing the mouse after dragging it creates a gradient proportional to the length of the drag.īelow should be the resulting gradient layer mask effect:Īfter repeating the above steps for each layer, and varying the gradients appropriately:.With the Blend tool selected and configured as above, Click on the right side of the image, and drag the mouse left.(so hide the other layers, and select the bottom layer to be active). In this step I’ll focus on the bottom layer only… Right click a layer > “Add layer mask” > choose default “White full opacity” > Add:Ĭlick the arrows to “Reverse” the gradient choose “Bi-linear” shape mode: Open all images as separate layers in a new GIMP canvas: Some simple notes on how to seamlessly blend images in GIMP using gradient based layer masks.Ĥ images with only different shutter speeds:
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