How to remove unnecessary part from the cutting image.

*do the same procedure, drag drop the image in new file as shown in 130.

 

*if u look the image, there is some unnecessary parts in the image.
* select the magnetic tool and select that unnecessary part as shown in fig 131.

 

*if you want to select the part more accurately then zoom that part as shown in fig 132

 

* you can change the size of the brush as shown in fig 133