Clipping image in dump image command

Hi, I want to dump simulation images that does not show the whole simulation region rather a part of it.

Mine is a cylindrical region in which the segregation of particles by induced vibration is being studied. When I dump the images with the following syntax of command, it dumps the whole cylinder along with the simulation box. What I want is to clip the image at half of the x-axis something like this http://www.cfdem.com/system/files/sc_10per_overlap_coord.png

dump dump_image all image ${Dump_freq_image} png/horizontal*.png type v_diameter_range zoom 1.3 view 90 0 center d ${image_x} 0.5 0.5 size 1024 1024 axes yes 0.1 0.01

Tried almost all options but no luck at all. Write now the image looks like the attached image.

Any one please help.