UIColor colorWithRed:green:blue: always produces black

Question

I have come across many instances when I try to make custom color through code and the result is quite different from Photoshop, e.g

[UIColor colorWithRed:(160/255) green:(97/255) blue:(5/255) alpha:1];

the resultant color is blackish, whereas it should me something like yellow. When working using sliders, the result is as expected.

Is there a problem with my Xcode or it is a general issue?