Hello Experts,
I'm creating a bitmap object like this:
Bitmap myImage = new Bitmap(1024, 1024,
System.Drawing. Imaging.PixelFo rmat.Format24bp pRgb);
But when I invoking the function myImage .MakeTransparen t() (with or without
parameters), the myImage.PixelFo rmat changes to Format32bppArgb .
Why is that and how can I avoid it but still making the Bitmap transparent ?
----------
Thakns
Sharon
2  7526 
The 24bpp pixel format doesn't define transparency (Alpha) and so the system
automatically changes to a format that can express the transparent value.
There is no way to display a 24bpp image with transparency on a per-pixel
basis.
--
Bob Powell [MVP]
Visual C#, System.Drawing
Ramuseco Limited .NET consulting http://www.ramuseco.com
Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm
Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm
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"Sharon" <Sh*****@newsgr oups.nospam> wrote in message
news:1A******** *************** ***********@mic rosoft.com... Hello Experts,
I'm creating a bitmap object like this:
Bitmap myImage = new Bitmap(1024, 1024,
System.Drawing. Imaging.PixelFo rmat.Format24bp pRgb);
But when I invoking the function myImage .MakeTransparen t() (with or
without
parameters), the myImage.PixelFo rmat changes to Format32bppArgb .
Why is that and how can I avoid it but still making the Bitmap transparent
?
----------
Thakns
Sharon
Hi Sharon,
Generally speaking, 24bit only includes RGB (three colors), not include
alpha value. So it can't produce transparent effect. I think this is the
reason when invoking the function MakeTransparent (), the PixelFormat
changes to Format32bppArgb . Because it will need alpha value(8 bits) to
generate transparent effect.
Best Regards,
Terry Fei [MSFT]
Microsoft Community Support
Get Secure! www.microsoft.com/security
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Subject: Why the Bitmap.MakeTran sparent() changes the PixelFormat ?
Date: Mon, 27 Feb 2006 02:15:27 -0800
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Hello Experts,
I'm creating a bitmap object like this:
Bitmap myImage = new Bitmap(1024, 1024,
System.Drawing .Imaging.PixelF ormat.Format24b ppRgb);
But when I invoking the function myImage .MakeTransparen t() (with or
withoutparameters), the myImage.PixelFo rmat changes to Format32bppArgb .
Why is that and how can I avoid it but still making the Bitmap transparent
?
----------
Thakns
Sharon This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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