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The color dialog will remember the last 4 used colors.
Please note that no alpha value can be set in the color dialog. Use the opacity property instead.
Some widgets (image) support a tint color. That color is added to the image's original colors. This works best for mono-chromatic images and images with alpha transparency (like PNGs). A tint of white (#ffffff) will display the original colors as is. A tint of black (#000000) will display original colors in black.