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CSS (perhaps with Compass): Cross-browser gradient
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With Photoshop, how to batch replace white background with transparent in the image
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Ubuntu 20.04 change background to solid colour
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Alpha over layers but maintain environment background
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Multi-color linear gradient in WinForms
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How do I make my textures transparent instead of white?
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How to do selective-color in Photoshop?
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How to set opacity with gdal_rasterize
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How can I make sure that my on-screen colors are consistent?
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How do I create subtle background gradients like this?
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Use CSS3 transitions with gradient backgrounds
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Can I set background image and opacity in the same property?