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I have an image with alpha channel, I need to save it as 32-bit BMP. However, Microsoft Paint doesn't allow saving as 32-bit, only 24-bit. I have Photoshop CS5, but it also doesn't have the option to save as 32-bit BMP.

Any solution?

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up vote 7 down vote accepted

Photoshop >> Menu >> File >> Save As >> Choose format BMP in dropdown box >> Save button >> Choose 32-bit format >> OK button

However, photoshop will save the image as XRGB. In case the image has alpha channel (as ARGB), must use another tool:

In Pixelformer, choose Menu >> File >> Export, Choose export file type as .bmp, Click 'Save', the following BMP options dialog should be shown, choose 32bit ARGB: enter image description here

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Well... Pixelformer gives me an XRGB anyway, do I need some special save procedure? – ST3 Aug 27 '14 at 8:37
XRGB means leading zero, ARGB means leading alpha – jondinham Aug 27 '14 at 10:17
I know that, however alpha is not included. – ST3 Aug 27 '14 at 10:29
see the screenshot i've just added – jondinham Aug 27 '14 at 11:10
I don't know why, but result doesn't contain alpha for me.. – ST3 Aug 27 '14 at 11:44

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