Transparency problem drawing bitmap

[David Hoffer]

I am creating a custom user control and I am having problems with setting
the transparent color of the bitmap. Here is my code...

protected override void OnPaint( PaintEventArgs e )

{

System.Drawing. Imaging.ImageAt tributes imageAttributes = new
System.Drawing. Imaging.ImageAt tributes();

imageAttributes .SetColorKey(Co lor.FromArgb(23 1, 231, 231),
Color.FromArgb( 231, 231, 231), ColorAdjustType .Bitmap);

Point ulCorner1 = new Point(0, 0);

Point urCorner1 = new Point(GetBitmap Size().Width, 0);

Point llCorner1 = new Point(0, GetBitmapSize() .Height);

Point[] destPara1 = {ulCorner1, urCorner1, llCorner1};

Rectangle srcRect = new Rectangle( 0, 0, GetBitmapSize() .Width,
GetBitmapSize() .Height);

e.Graphics.Smoo thingMode = SmoothingMode.H ighQuality;

e.Graphics.Inte rpolationMode = InterpolationMo de.HighQualityB icubic;

e.Graphics.Pixe lOffsetMode = PixelOffsetMode .HighQuality;

e.Graphics.Draw Image(m_Selecte dImage, destPara1, srcRect,
GraphicsUnit.Pi xel, imageAttributes );

}

I want the specified RGB color (231, 231, 231) to be transparent, but it
isn't. What am I doing wrong? I thought imageAttributes .SetColorKey() was
supposed to do this.

-dh

[100]

Hi David,
Your code works for me. Are you sure about the rgb components of the color
you want to make transparent.
Do you have such a color in your image.

B\rgds
100

"David Hoffer" <dh************ @xrite.remove.c om> wrote in message
news:ux******** ******@tk2msftn gp13.phx.gbl...

I am creating a custom user control and I am having problems with setting
the transparent color of the bitmap. Here is my code...

protected override void OnPaint( PaintEventArgs e )

{

System.Drawing. Imaging.ImageAt tributes imageAttributes = new
System.Drawing. Imaging.ImageAt tributes();

imageAttributes .SetColorKey(Co lor.FromArgb(23 1, 231, 231),
Color.FromArgb( 231, 231, 231), ColorAdjustType .Bitmap);

Point ulCorner1 = new Point(0, 0);

Point urCorner1 = new Point(GetBitmap Size().Width, 0);

Point llCorner1 = new Point(0, GetBitmapSize() .Height);

Point[] destPara1 = {ulCorner1, urCorner1, llCorner1};

Rectangle srcRect = new Rectangle( 0, 0, GetBitmapSize() .Width,
GetBitmapSize() .Height);

e.Graphics.Smoo thingMode = SmoothingMode.H ighQuality;

e.Graphics.Inte rpolationMode = InterpolationMo de.HighQualityB icubic;

e.Graphics.Pixe lOffsetMode = PixelOffsetMode .HighQuality;

e.Graphics.Draw Image(m_Selecte dImage, destPara1, srcRect,
GraphicsUnit.Pi xel, imageAttributes );

}

I want the specified RGB color (231, 231, 231) to be transparent, but it
isn't. What am I doing wrong? I thought imageAttributes .SetColorKey() was supposed to do this.

-dh