Is there some way to convert a Bitmap from one PixelFormat (16bit or with
indexed colors) to another(24bit), without doing per pixel operations?

You can convert from any format to 32 or 24 bpp easily. However, converting
to an indexed format from either of those requires the use of per-pixel
operations.

Ideally you'd use LockBits to facillitate these operations

See the GDI+ FAQ for details. It demonstrates LockBits and how to convert
from 32bpp into 1bpp.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

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"Flix" <(E-Mail Removed)> wrote in message
news:433034f5$0$8476$(E-Mail Removed)...
> Is there some way to convert a Bitmap from one PixelFormat (16bit or with
> indexed colors) to another(24bit), without doing per pixel operations?
>

Hi Flix,

I found this:

private void button3_Click(object sender, System.EventArgs e)
{
Bitmap b1=new Bitmap("augustinus_16ColorBitmap.bmp");

Bitmap b2=new
Bitmap(b1.Size.Width,b1.Size.Height,System.Drawing.Imaging.PixelFormat.Forma
t24bppRgb);
Graphics g = Graphics.FromImage(b2);
g.DrawImage(b1,new Point(0,0));
g.Dispose();

System.Console.WriteLine("b1.PixelFormat="+ b1.PixelFormat.ToString());
System.Console.WriteLine("b2.PixelFormat="+ b2.PixelFormat.ToString());

this.BackgroundImage=b2;
}

Christiaan.



"Flix" <(E-Mail Removed)> wrote in message
news:433034f5$0$8476$(E-Mail Removed)...
> Is there some way to convert a Bitmap from one PixelFormat (16bit or with
> indexed colors) to another(24bit), without doing per pixel operations?
>
>

Thank you !