How can I check the color depth of a Bitmap?

c# image bitmap color-depth bit-depth
Chris Thompson picture Chris Thompson · Jan 27, 2010 · Viewed 22k times · Source

I'm working on an application that prints a folder of image files, including JPEG and TIFF. The TIFF images are usually Black and White (1bpp).

After loading the image, I want to determine if the image is Color or B&W or Grayscale so I can send the image to the right printer (color printer or black and white printer).

I'm using the Bitmap constructor image = new Bitmap(filename); to load the image.

EDIT: The answer to check the pixel depth is great for B&W. Any ideas on checking if the image is grayscale without iterating through every pixel?

Answer

Neil N picture Neil N · Jan 27, 2010

Just check this property

image.PixelFormat

It will match one of the values in System.Drawing.Imaging.PixelFormat

Though you would want to send more than just Black & White to the B&W printer, you should also send any gray scales there as well.

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