Getting a bitmap pixel color

[cello1000]

I have a CBitmap object that has loaded an image. How can I get or set the color of a specific pixel?

 

[LyMc]

There are lots of places to look on the web for file formats; the specs for the MS bmp bitmap can be found at

http://www.wotsit.org/search.asp?s=graphics,

for one. Note that even for something as simple as a bmp you have to do a lot of file decoding before you can get one pixel information; you have to take into account the color depth of the bitmap, whether it's palletized, x/y extents, etc, etc. You may be able to locate code that will do it; I've always just "grown my own".

 

[apatterno]

Or, you can blit the bitmap to an offscreen DC and call GetPixel on it.

_{I REALLY hope that helps.}
Will

 

[timmay3141]

Right after posting this I realized I could do what you suggested apatterno, but the question is, how can I set the color of a pixel? I can use CDC::SetPixel to set it on the DC, but that won't change it on the bitmap itself, will it? It seems like Microsoft would/should have made something like this fairly easy.

 

[timmay3141]

Oops...cello1000 is a friend of mine and I posted this at his house under his name...but I'm the one who made this topic. Anyway, is there a way to get a DC's image as a bitmap?

 

[PerFnurt]

>is there a way to get a DC's image as a bitmap?

The DC's image is a bitmap.
- Which bitmap?
- The bitmap that is selected into it.

/Per
_{Nerdy signatures are as lame as the inconsistent stardates of STTNG.}