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

Posted on 2001-07-31
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Last Modified: 2013-11-20
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?
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Question by:postrowski
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8 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 6338376
See the article http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwui/html/msdn_icons.asp ('Icons in Win32') - maybe this is of some help.
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LVL 49

Expert Comment

by:DanRollins
ID: 6338456
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



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Author Comment

by:postrowski
ID: 6338578
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.
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LVL 49

Expert Comment

by:DanRollins
ID: 6341083
Show the code that you use to render the icon.  I suggest using LoadImage(...,IMAGE_ICON,...) rather than LoadIcon.

-- Dan
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Author Comment

by:postrowski
ID: 6342378
I was using LoadIcon:

   m_pImageList = new CImageList();
   m_pImageList->Create(16, 16, ILC_MASK, 10, 0);
   m_pImageList->Add(AfxGetApp()->LoadIcon(IDI_DB_ICON1));
   m_pImageList->Add(AfxGetApp()->LoadIcon(IDI_DB_ICON2));
   ...
   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.
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Accepted Solution

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DanRollins earned 400 total points
ID: 6347315
>> ... ::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
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Assisted Solution

by:bcox24
bcox24 earned 400 total points
ID: 6350180

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.  

-Bryan

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Expert Comment

by:Roshan Davis
ID: 9521083
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.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

Roshan Davis
EE Cleanup Volunteer
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