problems converting to 8-bit image

Posted by Name Suppressed - 000002948 on
URL: http://imagej.273.s1.nabble.com/problems-converting-to-8-bit-image-tp3703137.html

I have quite a few images of plant roots traced in blue and black
marker. I'm trying to do some fractal analysis and want to convert
these images to 8-bit grayscale. The images are currently 8-bit color.
I've tried using 'image->type->8-bit' and that works for some of my
images, but for others the entire image becomes black. I tried
thresholding first and that will convert the entire root system to
black, but when I try converting to 8-bit grayscale the entire image
still becomes black.  Is there anything I can do about this?

Thanks,
Kathryn Barto
Environmental Science PhD Program
Wright State University