How to turn a PictureBox image into greyscale?

[Michel Jr]

Hello,


I'm developing an OCX like an IE button.
How can I turn the image of the PictureBox into GreyScale (like a disabled button)?
Is there any Windows API to do this?
I know about changing each bit of the picture by a grey bit, but I think its a very slow solution.
Some ideas?

Thanks a lot.

Michel Jr.