Bitmap to Icon Wizard lets you create high-quality, multi-size icons from bitmap files. It supports generation of icons with transparency, including 32-bit, alpha-channel transparency. Bitmap2icon takes a large bitmap (which must have a clearly defined background colour if the icon is to have transparent areas).

Bitmap2icon supports four colour depths (32-bit with alpha channel, 24-bit, 8-bit, and 4-bit) and five icon sizes (256×256, 48×48, 32×32, 24×24, and 16×16). The large bitmap you supply is automatically resampled to produce these device images. If you have enabled transparency, it generates the standard/alpha mask in this resizing process. You can choose which colour depths and sizes to use in your icon file.

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