Changing Colors in Bitmaps and Making Icons from Them

Environment: MFC/GDI

The day has come when I need to have a large number of identical icons with only one difference—some colors will change from icon to icon. I found the solution for making all of my icons from a single bitmap, and changing colors on the fly. So, I wrote my CCloneBitmap class. It is derived from CBitmap and is able to change colors and export 32x32 icons.

It is very simple to use. Just follow these steps:

  1. Load the bitmap using the LoadBitmap() function.
  2. Make a clone of this bitmap by calling a Clone() method.
  3. Change colors of the bitmap by calling a ChangeColor() method.
  4. You can make a 32x32 icon from this bitmap (if bitmap is 32x32).

Here is a simple example of how to use this class:

CCloneBitmap bmpClone;
HICON hIcon;
  bmpClone.ChangeColor(IRGB(0,0,0), IRGB(255,0,0));
  // change BLACK pixels to RED ones.
  // make icon, using WHITE color as transparent.
Note: Remember to use the IRGB() macro instead of RGB().

If you have a color in the COLORREF variable, use the INVERSECOLOR() macro:

bmpClone.ChangeColor(IRGB(0,0,0), INVERSECOLOR(myColor));


Download source - 2 Kb


  • Help with dynamic bitmap

    Posted by Legacy on 02/10/2004 12:00am

    Originally posted by: VIjay Shan

    I found your article to be extremely helpful, though had a couplea questions how do i use this class if i have a modified bitmap (cbitmap*). when i paste this bitmap into the clipboard it works fine but when i get a handle and pass it to the clone function and use makeicon it just gives me a black square back. whereas when i try the samething with a preproduced bitmap it works fine. Any kinda help would be appreciated.


  • Great, but if you (or someone) would please....

    Posted by Legacy on 05/30/2003 12:00am

    Originally posted by: Chris

    Hello, I'm a Borland C++ Builder programmer and I'd love to use that code, I have MSVC++ and have dabbled in it... I've managed to convert most of the code, but I'm having problems, I was wondering if you could convert it into standard Windows SDK code(nothing like CDC or CBitmap used) and then post it for all programmers to use.
    Thanks and have a nice day. :)

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date