Posted by
karo03 on
URL: http://imagej.273.s1.nabble.com/Isolating-the-background-pixels-from-foreground-pixels-tp5003764p5003767.html
Hi Geology Guy, possibly geologists think different.
There are gray or color images with bright background and others with a dark background. This should not be mixed up with the representation of binary images. Foreground is always the set of pixels which are thresholded (shown with the small box) in the histogram of the interactive thresholding window. They get a value of 255. The background gets 0. Still by the Options->Colors… you can select the representation of foreground and background pixels.
Maybe some clarification for you?
Karsten
(I have to confess that I rarely read manuals, I prefer trial and error)
Am 04.07.2013 um 22:49 schrieb Geology Guy <
[hidden email]>:
> Dear Karsten,
> Thanks for your response. I checked the Edit> Options> Colors and the
> background is black while the Foreground is White. This is what I expect
> because after reading the Image J manual, I learnt that Image J only makes
> calculations from binary images when the background is black and the
> foreground is white.
>
> I am using the default thresholding (i.e. AUTO) and checked the DARK
> BACKGROUND BOX. Then when I was ready to do binary image a,dialogue box
> popped up and I unchecked the box next to "BLACK FOREGROUND and WHITE
> BACKGROUND". Again this setting that I am using is because the Image J
> manual recommended a background that is black and white foreground in order
> to be able to carry out calculations involving binary imaging. Or am I wrong
> somewhere maybe that's why the background pixels are getting picked up in
> the foreground when I try to calculate Area for foreground objects ONLY?
> Thanks for your help.
>
>
>
>
>
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