Posted by
Bill Rothman on
Dec 21, 2009; 7:16pm
URL: http://imagej.273.s1.nabble.com/wand-tp3689962p3689966.html
Michael,
Thank you, much clearer now.
ImageJ(fiji) needs an up-to-date glossary.
Bill
________________________________
From: ImageJ Interest Group on behalf of Michael Schmid
Sent: Mon 12/21/2009 2:00 PM
To:
[hidden email]
Subject: Re: wand
Hi Bill,
it seems that the description of the wand tool options is missing in
the documentation.
Tolerance: The Wand takes the pixel value where you click as an
initial value. It then selects a contiguous area under the condition
that all pixel values in that area must be in the range initial_value
- tolerance to initial value + tolerance.
4-connected: Only the four neighbors of a pixel are considered
neighbors. E.g., the wand does not follow a one-pixel wide diagonal
line because the pixels of that line are not four-connected.
8-connected: Each pixel is considered to have 8 neighbors. So the
wand follows a diagonal line if you click onto it. On the other hand,
if you have an area of constant value dissected by a one-pixel wide
diagonal line, the 8-connected wand will "jump over the line" and
include the other part of that area.
The wand has no fixed width; the selected area depends on the image
data. If you want to select an area of 5 pixels width use the
selection brush. You find it by right-clicking into the Oval tool;
double click for setting the width.
The selection brush is not macro-recordable. If you want to save a
selection created by the brush, use the ROI manager; restoring a
selection from the ROI manager can be done in a macro.
Michael
________________________________________________________________
On 21 Dec 2009, at 17:19, Rothman, William wrote:
> Michael,
> Thanks for you quick response.
> But what is tolerance and does 4-connected mean 4 pixel wide wand??
> Bill R.