perimiter measurement problem

[Uknalis, Joseph]

After setting the scale. I take an image, convert it to 8 bit, threshold, then make binary (tho is this last step necessary?).
Area and perimeter are selected as measurements, but it seems I need to draw a box around my object to get correct area measurements.
Perimeter was giving me the length of the entire window, or the length of the ‘box’ I drew to enclose my object.

Same problem on 3 different PCs and Mac.

Any ideas?   Thanks

 Joe




This electronic message contains information generated by the USDA solely for the intended recipients. Any unauthorized interception of this message or the use or disclosure of the information it contains may violate the law and subject the violator to civil or criminal penalties. If you believe you have received this message in error, please notify the sender and delete the email immediately.

--
ImageJ mailing list: http://imagej.nih.gov/ij/list.html

[Michael Schmid]

Hi Joe,

for area and perimeter measurements, don't convert to binary but rather select it: either manually with the Wand tool or with Edit>Selection>Create Selection (if you have a single object).

If you run Analyze>Analyze Particles, this will be done for all thresholded objects (or all objects in a binary image).

If you have a binary image and just press 'Measure', it will do the measurement for the whole image.

Michael
________________________________________________________________
On Mar 28, 2013, at 18:54, Uknalis, Joseph wrote:

> After setting the scale. I take an image, convert it to 8 bit, threshold, then make binary (tho is this last step necessary?).
> Area and perimeter are selected as measurements, but it seems I need to draw a box around my object to get correct area measurements.
> Perimeter was giving me the length of the entire window, or the length of the ‘box’ I drew to enclose my object.
>
> Same problem on 3 different PCs and Mac.
>
> Any ideas?   Thanks
>
> Joe

--
ImageJ mailing list: http://imagej.nih.gov/ij/list.html