threshhold and txt pixel designation

Posted by Naomi Barth on Jan 23, 2006; 5:01pm
URL: http://imagej.273.s1.nabble.com/threshhold-and-txt-pixel-designation-tp3703964.html

hi
I apologise if these questions have been answered before, but I currently
have two questions about Image J that I need help with.
1)  After converting a 8-bit image to a txt file.  How do I know what
numbers of the file correspond to what pixel from the image?  And when a
stack of image has been converted how can I tell which numbers are from
which image of the stack?  I need to compare every pixel to every other
pixel once it has been converted to binary, but I need to know what vector I
used to compare them with, so I need x, y, and z components for every pixel,
and currently I am unsure about how the txt file is set up.


2)  How do you set a threshold value for turning an 8-bit image into a
binary one.  I need to be able  to set a threshold and then see what it
looks like.  I have a two-phased material that I want to be shown only in
black and white, but I want to make sure that the threshold that I am using
is correct, so I need to able to see it.  Eventually the threshold value
will be used in a script that will convert a stacked txt file into binary.

Thank you very much
-Naomi Barth