Getting the pixel value of BMP file

Question

i got a question for reading an bmp image. How can i get the pixel value(R, G, B values) in an bmp image? Can anyone help me using the C programming language?

Answer 1

The easy way would be to find a good image manipulation library for your chosen platform and use that.

• Linux ImLib / GDK-Pixbuf (Gnome/GTK) / QT Image (KDE/Qt) should be able to do what you need.
• Windows I'm not familiar with the appropriate system library, but an MSDN Search for "Bitmap" is probably a good place to start.
• Mac OSX Cocoa has some image manipulation capabilities, see this article.

The hard way would be to open the file and actually interpret the binary data within. To do that you'll need the BMP File Specification. I'd recommend trying the easy way first.