TrakEM2 segmentation

[adayal]

Hi,

I am using photoshop to highlight a certain region in my EM images and then registering these serial images using TrakEM2. I am now trying to create a 3D model of this region and am stuck on the manual segmentation step. The region that I want to segment is already segmented as it is a different color than the neighboring area. I would like to avoid having to redraw an outline around this area and was hoping for a way of telling TrakEM2 to use the obvious color difference as a way to segment the image. I have attached in example image to the post. I am interested in modeling the yellow region of the image without having to redraw all the outlines.