On Thu, May 30, 2013 at 09:48:02PM +0000, Miriam Cezza wrote:
> I can see that I can measure those values with this program but one at
> the time. Since I have hundreds of agglomerates, is it possible to
> tell the program to calculate those values for all the grains that it
> sees and put them in a table?

Grain Distributions can either plot a histogram or export a table of
selected quantities to a file for further analysis in other software.
Use option Export Raw Data in the dialog for the latter.

> Also, I noticed that I can do the histogram of the mean radius (and
> other values) (data process >> grains >> distributions), which is
> basically what I need, but most of the agglomerates appear to have
> mean radius = 0. And I also did that by increasing the height value of
> the threshold, so that to eliminate the very small grains, but again,
> the mean radius of the majority of grains showed in the histogram is
> zero.

If you see it in the histogram then it may be due to an unfortunate
automatic choice of histogram bins.  When you have many small
grains and a few very large ones the bin may be chosen too small and
many the small grains end up in the ‘zero’ bin.  Try choosing a fixed
resolution (number of bins) in the dialog and entering a larger value.

If you see it in the raw export then it's a bug.  All grains must have
positive estimated mean radius (with minimum of about 0.6 of pixel side
for single-pixel grains).

Regards,

Yeti


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