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| Jax |
| GOOD ANSWER |
Whenever I use this method I get out of memory exception, even when using tiny bitmaps (100X100).
Does anyone know why this is?
From what I remember OutOfMemory Exception is a default for other exceptions, does anyone know what it might be?
I am of course using try catch and finally blocks to ensure in cases of exceptions resources get released, I just can't understand why i'm always getting this exception.
Help me people of the newsgroups, you're my only hope.
jax
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| Bob Powell [MVP] (VIP) |
| GOOD ANSWER |
Can you post code that demonstrates this? It seems to be working fine for
me.
--
Bob Powell [MVP]
C#, System.Drawing
Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/gdiplus_faq.htm
Read my Blog at http://bobpowelldotnet.blogspot.com
"Jax" <Click here to reveal e-mail address> wrote in message
news:Click here to reveal e-mail address...
> Whenever I use this method I get out of memory exception, even when using
tiny bitmaps (100X100).
[Original message clipped]
getting this exception.
[Original message clipped]
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| Jax |
| GOOD ANSWER |
It's as simple as:
(psuedo)
FileStream fs = new FileStream(@"c:\myImage.bmp", FileMode.Open);
Bitmap b = Bitmap.FromStream(fs);
try
{
Label theColour= new Label();
// client side script where the user clicks the image
int x = Convert.ToInt32(TextBox1.Text);
int y = Convert.ToInt32(TextBox2.Text);
theColour.BackColour = b.GetPixel(x,y);
b.MakeTransparent(theColour.BackColor); // Error here, OutOfMemoryException
b.SaveAs(fs, ImageFormat.Jpeg); // Occasionally error here, unspecified.
Image1.Url = "c:\myImage.Jpg";
}
catch(Exception ex)
{
Response.Write(ex.ToString());
}
finally
{
b.Dispose();
fs.Close();
}
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| John Fisher |
| GOOD ANSWER |
Hi,
I was just hunting down an answer to the same problem. It turns out that the Bitmap files I was loading were created with a 256 color bit-depth. My windows system is running 32-bit color. So, I loaded the bitmap file, then created a new Bitmap of the same width and height, but using a Graphics instance created from the desktop window. This produced a bitmap with the same color depth as my system. After that, I copied the original bitmap into the new one (with the right color depth). The new bitmap allows me to successfully call MakeTransparent!!
Here's my code.
// Get the current desktop screen graphics.
Graphics g = Graphics.FromHwnd(IntPtr.Zero);
// Make a bitmap using that color depth.
Bitmap bitmap = new Bitmap(originalbitmap.Width, originalbitmap.Height, g);
// Clean up.
g.Dispose();
// Start drawing on our new bitmap.
g = Graphics.FromImage(bitmap);
// Copy the loaded bitmap to the bitmap with proper screen depth.
g.DrawImage(originalbitmap, 0, 0, bitmap.Width, bitmap.Height);
// Clean up.
g.Dispose();
// Now we can successfully make the bitmap transparent!
bitmap.MakeTransparent(bitmap.GetPixel(0, 0));
--------------------------------
From: John Fisher
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