How do I read a 512x512 8-bit grey scale raw image file into a picturebox and display it in a small window?

Posted on 2005-04-21
Medium Priority
Last Modified: 2011-09-20
I have a 512x512 pixel, 8-bit raw, greyscale bitmap image file and would like to display and fit it in a small window.  How do I do it?
Question by:pcssecure
LVL 96

Expert Comment

by:Bob Learned
ID: 13832915
Where did this image come from?


Expert Comment

ID: 13835030
Is this a web app or a windows app?  And is the image a standard image file type (ie bmp, gif, jpg)?

If this is a web app, you can use client side script (javascript) to force a window.open to your specifications.  If the images change repeatedly, the script can easily be instantiated from server side code.

In the event method where you want to launch the image, use:

string script = @"<script language='javascript'>window.open('<image path>','windowName','width=512,height=512,scrollbars=false,toolbar=false,statusbar=false');</script>";
RegisterStartupScript("showimage", script);

On a button "submit" event, this will open a new window sized to your image with no toolbars, statusbar or scollbars.

Hope this helps.

LVL 10

Accepted Solution

smegghead earned 1500 total points
ID: 13839417
The following code will build a byte array with 262144 (512x512)  elements..

It then displays it onto a graphics device... it can be scaled using the parameters passed into the DrawImage method.

      byte[] id=new byte[512*512];
      int ThisPixel;
      int c1,c2;
      for (c1=0 ; c1<512 ; c1++)
            for (c2=0 ; c2<512 ; c2++)
      // We now have a nice pattern in the data
      Bitmap bm=new Bitmap(512,512,System.Drawing.Imaging.PixelFormat.Format24bppRgb);
      for (c1=0 ; c1<512 ; c1++)
            for (c2=0 ; c2<512 ; c2++)
                  bm.SetPixel(c1,c2,Color.FromArgb(ThisPixel,ThisPixel,ThisPixel)); // Grayscale equivalent
      e.Graphics.DrawImage(bm,50,50,100,100); // The size
      bm.Dispose(); // Tidy up


Author Comment

ID: 13840266
Thanks smegghead.  Your code works but the SetPixel call is too slow.  Takes about 1-2s to load a 512x512 image file.  I found some unmanaged code as well that does a better job.  Anyway, I'll give you points.

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