Another test

#declare p_modify1 =
pigment{
    pigment_pattern{p_original}
    pigment_map{
    #for(i,0,255)
        [i/255,
        bumps
        scale 1/input_wide_res
        scale 0.8
        rotate <0,0,20>
            color_map{
            [0.2+0.6*(1-pow(i/255,1/3)) rgbt<0,0,0,0.1>]
            [0.2+0.6*(1-pow(i/255,1/3)) rgbt<0,0,0,0.9>]
            }
        ]
    #end
    }
}

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