How to draw transparent image on a form?

I found a solution that will let you draw a BMP image with an alpha channel onto a form using only the Windows API.

The TransparentColorValue approach cannot possibly work, because this only works with images in which a single colour represents full transparency. In addition, you are toying with the form's transparent colour instead of image's transparent colour! The above PNG image is supposed to have an alpha channel, so it's not like every pixel is either shown or transparent -- instead, each pixel has an opacity between 0 and 1 (0.37, for instance).

That is, in addition to the R, G, and B components of each pixel, there is an 'alpha' component A.

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