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Demented Freak

Percentages of a B&W image

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I have a black & white image of a design for a rather large banner I'm making, I'm wondering if there is a way to work out home much of the image is black and how much is white (either as a number or a percentage will do). It's a fairly complex design and I need a reasonably accurate figure before we start. Any ideas on how I can work it out?

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Start counting the black pixels and minus what you get from the pics width x height to get how many are white?

 

;P

 

Is the picture straight black/white or grey scale?

No idea how one would figure out the answer but the above question probably needs to be asked.

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A bit of Googling and I came up with this;

(Step 1: Select > Color range for the range you want to count. Step 2: in the "Window" menu, select the "Histogram" tool. Step 3: Find the "Histogram" tab; among other things, it shows the number of currently selected pixels.)

That's on the assumption that you're using Photoshop.

 

Another suggestion on the same page that I found that gem suggests the use of this program;

http://rsb.info.nih.gov/ij/index.html

Though I'm not sure how easy it'd let you get to the required info, learning curve and all that.

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