[Gimp-user] 8 and 1 bit images

I would like to save some images as both 8 bit 256 grayscale image and
also 1 bit (2 color black and white).
I see I can convert an image to grayscale but how do you select that
you want to save the image as an 8 bit image. Also how do I save a 1
bit (2 color black and white) as a 1 bit image or is it sufficient to
save as an 8 bit image?

Gimp can create a 1 bit - black/white image. 

It needs to be converted to indexed mode Image -> Mode -> Indexed

Then check the 'Use black and white (1 bit) palette

You can then export the image as a gif or as a png

How to prove it is 1 bit. Imagemagick command line will give the image
properties or for a GUI XnViewMP as the screenshot.

Comparative image sizes, RGB 197k , grey 76k, 1bit 6k

rich: www.gimp-forum.net

* http://www.gimpusers.com/system/attachments/690/original/indexed.jpg

rich404 (via www.gimpusers.com/forums)

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