extract part of a bitmap

Hi,

I have a bitmap, and would like to create a new bitmap by extracting a (rectangular) part of the existing bitmap. What is the best way to do this

Answer this question

extract part of a bitmap

Brandon Bloom
not sure especially since im still learning doing the graphics stuff! I am still fascinated on how you can extract part of the image and save it...its cool

araymund

I've actually just looked into this myself and this seems to work, perhaps with a bit more tinckering....

Bitmap myExtractedPortion = new Bitmap(width, height);
Rectangle destinationRect = new Rectangle(0, 0, width, height);
Graphics myGraphics = Graphics.FromImage(Image)myExtractedPortion);

myGraphics.DrawImage(Image.FromFile("file.jpg"), destinationRect, srcX, srcY, myExtractedPortion.Width, myExtractedPortion.Height, GraphicsUnit.Pixel);

myExtractedPortion.Save("newFile.jpg", System.Drawing.Imaging.ImageFormat.Jpg);

does this work for you I guess you need to play a bit with it to get the portion you want extracted from the original image

Tom Regan
Yeah, I've thought of something like this. Just wondered if there's some cleaner way than drawing it... (specially if the source image has alpha)
extract part of a bitmap

Answer this question