Hi, Im new to Zbrush, I import background reference image with Image Plane tool, when I edit to 3D object, occur gray track on the background. Sorry for my english, ty.
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This is a known issue. It will appear worst when moving the whole model like you are doing. Clicking the background (off the model) will get rid of it.
The Grids provide a rather better way of using reference images:
http://docs.pixologic.com/user-guide/3d-modeling/reference-images/grids/
I will use grids for reference, Thank you very much.