On 01/22/2012 04:32 PM, Steve Kinney wrote:
That is even simpler than my suggestion. In my case it wouldn't have
worked because the colors did not contrast.
On 01/22/2012 03:59 PM, Stefan Maerz wrote:
A while ago I calculated area by creating a transparent layer and
painting with a brush the locations that I wanted to include in
the area. Then using GIMP's histogram (color>Info>histogram), I
got a pixel count for that new layer. (Side note, make sure you
have the right layer selected in the layers dialog)
Then I used a proportion ( Pixels:Inches ) that I got from a scale
in the image to calculated area.
WOW, I thought I knew some clever tricks but this one wins the
prize! In the case at hand, Select By Color with suitable threshold
adjustments in the Tool Options tab, followed by Colors> Info>
Histogram should do the trick. I just checked and if there is a
selection, the Histogram tool only looks at that.
An (perhaps simpler) alternative would be to use the "Ellipse Select
Tool" in the Toolbox to get a selection.
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