Write GIF is diffirent from Read GIF,Why?

winston 0

22y2.6kGDI+

i want read a GIF file to stream and then write stream to another place,but i find that my GIF file is diffirent from the old one, it is ugly then the old one, why this is the code System.Drawing.Bitmap TargetBitmap = new System.Drawing.Bitmap(bmp,bmp.Width,bmp.Height); System.Drawing.Graphics bmpGraphics; bmpGraphics = System.Drawing.Graphics.FromImage(TargetBitmap); System.Drawing.Rectangle rect = new System.Drawing.Rectangle(0, 0, bmp.Width,bmp.Height); bmpGraphics.DrawImage(bmp,rect,rect,System.Drawing.GraphicsUnit.Pixel); TargetBitmap.Save(mstream,System.Drawing.Imaging.ImageFormat.Gif); but when i read data from mstream, it is diffirent from the old one, it is not clearly then the old one, why?

4 Replies

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Mykonine22y ago
Oh, you wish to load a GIF, draw it on another image, and input THAT image? 1. Load the GIF to an instance of a Bitmap. 2. Draw the Bitmap instance onto another image. 3. Save the new image to file. If that doesn't work, it's because the program did some work with the image. You should be able to disable that intermediate work; I would check the API specifications.
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winston 022y ago
i just want kown why?i need draw some thing on the out put file, how can i just copy the file?
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Mykonine22y ago
I think, in this case, it would be better to simply copy the file.
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winston 022y ago
is there and settings in Graphics to make the picture more clearly?
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