Bob Powell [MVP] wrote:
> There are no real solutions to this problem. A 32 bit process has a 2
> gigabyte address limit but in reality the usable limits of memory in
> a .NET program are somewhat less.

>
> GDI+ is not well suited to dealing with large images and certainly, a
> 14000 by 10000 full colour image would hit the scales at a little
> over 534 megabytes.
>
> An image loaded into memory may have far more memory allocated to it
> than just the image file size. This is because the image itself might
> be held in memory and then the raster image is also held in it's
> fully expanded state. If the picture box is double buffered there may
> even be two full copies of the image in memory.

"Usenet User" <no.spam@no.way> wrote in message
news:a4g1149lmuq1ls7ijmq7m1nn7ieqfnmhk6@4ax.com...
> .NET 1.1/2.0
>
> I have a need to display high-resolution scrollable images in a .NET
> application (Windows Forms). One well known solution is to create a
> Panel with AutoScroll set to "true" and then add a PictureBox or
> another Panel to it, that is used to display the image.
>
> The above approach works, however, to my surprise, .NET GDI+-based
> graphics are not really hi-res friendly.
>
> Consider the following codes examples:
>
> 1)
> Bitmap b = new Bitmap( 6000, 6000 );
> panel2.BackgroundImage = b; // <-- Works OK
>
> 2)
> Bitmap b = new Bitmap( 14000, 10000 );
> panel2.BackgroundImage = b; // <-- "Out of memory" error
>
>
> The full stack of the error is:
>
> System.OutOfMemoryException: Out of memory.
> at System.Drawing.TextureBrush..ctor(Image image, WrapMode
> wrapMode)
> at System.Windows.Forms.Control.PaintBackground(PaintEventArgs e,
> Rectangle rectangle)
> at System.Windows.Forms.Control.OnPaintBackground(PaintEventArgs
> pevent)
> at
> System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e,
> Int16 layer, Boolean disposeEventArgs)
> at System.Windows.Forms.Control.WmEraseBkgnd(Message& m)
> at System.Windows.Forms.Control.WndProc(Message& m)
> at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
> at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
> at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
> at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32
> msg, IntPtr wparam, IntPtr lparam)
>
>
> Internally, the TextureBrush constructor makes a call to
> GdipCreateTexture() method in gdiplus.dll, and, apparently, there is
> some limit on the image size that the method can handle.
>
> Obviously, I am hitting some limit of GDI+ here, but still need to
> find a solution. I want to stay with .NET, if possible and avoid using
> any third-party ActiveX controls.
>
> What alternatives can I pursue?
> Will going with .NET 3.x and WPF help?
>
> TIA!