How can I display more than 16 colors in my icons?

I have an MFC ActiveX control, that I display from a web page. I want to use more than the standard 16 colors for some of the icons, but it never renders properly.

Does anyone know how to increase the palette size?
Who is Participating?
DanRollinsConnect With a Mentor Commented:
>> ... ::LoadImage( ... LR_DEFAULTSIZE));

Do you really want default-sized icons (32x32) in your tree?

I suggest forgetting about icons.  Use the Bitmap editor to make your bitmaps.  Press Alt+Enter to change the properties and set it to 256 colors.  Then paste the images from somewhere else.

For the toolbar, create it as a Toolbar resource in VC++ (it will create a 16-color bmp named Toolbar1.bmp).  Now use a bitmap editor to modify the images.  Save it as a 256-color bitmap.  Just avoid editting it in the IDE because it may save it back out as a 16-color bmp.

-- Dan
See the article ('Icons in Win32') - maybe this is of some help.
The problem is that by default, VC++ creates 16-color icons.  It is easy to fix:

1) In the Resource Editor, create a new icon.  
2) From the Image menu, Chhose "New Device Image"
3) Choose 32x32 256 colors (or choose Custom... and make the icon any size you want.
4) Paste a 256-color picture into the icon (I just copy a chunk from a Paint bitmap)

5) Delete the 16-color icon so that there is only one icon for the system to choose when you call LoadIcon, etc.

-- Dan

Upgrade your Question Security!

Your question, your audience. Choose who sees your identity—and your question—with question security.

postrowskiAuthor Commented:
OK, I did what Dan suggested, and that lets me create 256 color icons fine, but when the control is displayed in the web page, it still shows only the primary 16 colors. I think that somehow I need to realize the new larger palette.
Show the code that you use to render the icon.  I suggest using LoadImage(...,IMAGE_ICON,...) rather than LoadIcon.

-- Dan
postrowskiAuthor Commented:
I was using LoadIcon:

   m_pImageList = new CImageList();
   m_pImageList->Create(16, 16, ILC_MASK, 10, 0);
   m_ctlTree.SetImageList(m_pImageList, TVSIL_NORMAL);

In this case, I'm loading the icons into a CTreeCtrl.

I also tried using LoadImage:
   m_pImageList->Add((HICON)::LoadImage(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDI_DB_ICON1), IMAGE_ICON,0,0,LR_DEFAULTSIZE));

but I have the same problem.

I also have the same problem with the colors that render in my toolbar. For the toolbar, I'm using a 256 color bitmap, but it seems to be rendering as a 16 bit bitmap. I think if I can figure out how to get the toolbar to render properly as a 256 color bitmap, then the palette would be large enough to display my icons correctly in the CTreeCtrl.
bcox24Connect With a Mentor Commented:

Currently you create the image list by calling:
   m_pImageList->Create(16, 16, ILC_MASK, 10, 0);

Instead of ILC_MASK, try using ILC_COLOR8 or higher.  


Roshan DavisCommented:
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

Answered by: bcox24, DanRollins (points to be split)

Please leave any comments here within the next seven days.


Roshan Davis
EE Cleanup Volunteer
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.