@haiderijaz I've also PCC from Islamabad in black & white. Did you submit black & white? what was the outcome of your application.
My wife's pindi PCC was also black and white with a very faint blue stamp. It was so faintly blue that in the scan it looked black as well. It worked perfectly fine and we got our PR in 6 months.
So islamabad black and white should be just fine.