capture part of a bitmap

Question

hi,
i'm trying to find a way to crop a bitmap.  what i need to do is take a segment of an existing image and 'cut-n-paste' it onto a separate bitmap

i've tried using graphics.fromimage()

Rectangle saveArea = new Rectangle(intX * intSquareSize, intY * intSquareSize, intSquareSize, intSquareSize);
                                bmp[intX, intY] = new Bitmap(saveArea.Width, saveArea.Height);
                                using (Graphics g = Graphics.FromImage(bmp[intX, intY]))
                                { g.DrawImage(bmpPic, saveArea); 

but what that does is save the entire original image (bmpPic) into a new bitmap (here bmp[intx, inty]) but resized to fit this new bmp instead of cropping out the area that I would like the saveArea rectangle to specify.

can any one help?

BadButBit

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my code is perfect until i don't find a bug

Answer 1

Hi,

Here is a sample.

Hope it helps.

            Image iSource = Image.FromFile(@"c:\users\tamer\desktop\a.jpg");//load the orginal file
            int width = 100;//determine the width of the area will be copied
            int height = 100;//determine the height of the area will be copied
            Image iNew = new Bitmap(width, height);//create a new image
            Graphics g = Graphics.FromImage(iNew);//create graphics object
            Rectangle destRect = new Rectangle(0, 0, iNew.Width, iNew.Height);//create destination rectangle
            Rectangle srcRect = new Rectangle(50, 100, width, height);//get from (50,100) to (150,200). source rectangle
            g.DrawImage(iSource, destRect, srcRect, GraphicsUnit.Pixel);//draw image
            iNew.Save(@"c:\users\tamer\desktop\a2.jpg");//save new image
            g.Dispose();//dispose graphics

Answer 2

bif, bam, boom!

and that solves that problem...

thanks.  i was missing the 'GraphicsUnit.Pixel' business.

BadButBit

---

my code is perfect until i don't find a bug

Answer 3

    Bitmap cropBitmap(Bitmap originalBitmap, Rectangle cropRectangle)
    {
      return originalBitmap.Clone(cropRectangle,originalBitmap.PixelFormat);
    }