Excluding regions from greyscale profiles

[Fitzgabbro]

I am trying to draw profiles along lines of 5-10 pixel width across crystals, but these crystals have cracks.  Where these cracks intersect the line, I would like imagej to ignore them, and average only over the width of the line that is not over the crack.  Is there a way of drawing round the cracks (and other defects), and to then exclude those regions from the profiles I draw?  The functions to do this with ROIs don't seem to work for lines.

Thanks,
Gareth

[tasger]

Hi - i have the same issue. Did you find a solution?

Regards,

Asger

[Nathaniel Ryckman]

I'm not exactly sure what you are asking. Do you have an image for an example that we could see?

[Fitzgabbro]

Here is an example:



The vertical white line is the profile I wish to draw. The brightness of the image is proportional to the chemical composition of the crystal, except where there are cracks.  I would like to draw round the cracks, and the get ImageJ to ignore the values of any pixels within those areas.

Thanks!