-24.31% is the change from 255 to 193
Calculation steps:
[( 193 - 255 ) ÷ 255] x 100 = -24.31%
Formula
Percentage change = [(193 - 255) / 255] x 100
Subtract the new number by the original number
193 - 255 = -62
-62 ÷ 255 = -0.24313725490196078
-0.24313725490196078 x 100 = -24.31%