Save XY Coordinates... - override background colour selection

[Justin Walker-3]

Is there any way to override the background colour selected for the
'Save XY Coordinates...' command?  Frequently there is an object of
interest in the top left hand corner of my image, and that causes the
function to select that as the background colour, making it ignore all
of my objects of interest and outputting a massive file filled with the
coordinates of all the 'true' background pixels.  My true background is
always white (greyscale 0).  Alternatively, can I simply set the value
of the top-left pixel to a greyscale of zero?  I'd lose one pixel from
my object, but at least it would force the background colour to be zero.

Thanks

- Justin Walker
University of Maryland

[Wayne Rasband]

On Aug 6, 2008, at 3:56 PM, Justin Walker wrote:

> Is there any way to override the background colour selected for the
> 'Save XY Coordinates...' command?  Frequently there is an object of
> interest in the top left hand corner of my image, and that causes the
> function to select that as the background colour, making it ignore all
> of my objects of interest and outputting a massive file filled with
> the coordinates of all the 'true' background pixels.  My true
> background is always white (greyscale 0).  Alternatively, can I simply
> set the value of the top-left pixel to a greyscale of zero?  I'd lose
> one pixel from my object, but at least it would force the background
> colour to be zero.

In the v1.41j daily build, with grayscale images, you can specify the
background value in the Analyze>Tools>Save XY Coordinates dialog box.

-wayne