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Asked: 2026-05-23T05:27:48+00:00

I’m creating icons for my usercontrols using Paint.NET. I’d like to have proper transparency

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I’m creating icons for my usercontrols using Paint.NET. I’d like to have proper transparency like 32 bit PNG or BMPX provides. Is there a way to achieve that? Looking at the toolbox, the regular Label control does seem to use a fully transparent icon (unless MS assumes an always white toolbox background?).

Currently I’m embedding my icons as bitmaps compiled to embedded resource, and use the ToolboxBitmapAttribute(Type, String) constructor. I tried using ICO or PNG or BMPX, but none of those work at all, they don’t even get displayed, whereas a simple BMP does get displayed (using the lower left corner pixel color as transparent color).

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1 Answer

  1. Editorial Team

    The built-in Winforms toolbox bitmaps use Color.Fuchsia as the background color. A pretty standard choice as the Bitmap.MakeTransparent() color, it is a nice fuchsed up color that is unlikely to cause unintended transparency in the rest of the image. Here’s the one for the Label control, retrieved from the System.Windows.Forms.dll assembly:

    enter image description here

    It got turned into a PNG while uploading it, it is actually a BMP.

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