c# 4.0 - C# winform picturebox image lost after saving data -


i have winform application in there picturebox displays pretty big image (2550by4500). bitmap image transformed byte array using unsafe pointer, this:

     bitmap img;         unsafe      {          fixed (byte* intptr = &outbuffer[0])          img = new bitmap(_width, _height, _width * 3, system.drawing.imaging.pixelformat.format24bpprgb, new intptr(intptr));      }

so far, no problems. after displaying image, saved pixel values matlab .mat file using dll (http://www.mathworks.com/matlabcentral/fileexchange/16319). still, no problem saving.

however, image in picturebox became noisy black-white image, original image lost.

things tried:

  1. added bitmap in watch window, found out pixel values changed. bitmap corrupted.
  2. do unsafe transformation again everytime after saving, however, brings problem: "accessviolationexception in drawing.dll".

something must have .mat saving part, because if skip saving, no problem @ all. not know how related, memory? tried smaller size image, no problem. i'm assuming "save .mat" process corrupted bitmap?

any idea helpful! thank you


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