[converting 2d image to 3d model problem]

Dear sir,

when I import 2d image in cura for 3d model ,

it extrude it automatically but is there any way it extrude with out any angles and extrude the pixels in right angle ( 90 degree) ,in other words,

as you see in this pictures the top surface of pixels is smaller than bottom side,

is there any way the bottom and top size of pixel will be the same size?

I used many setting in convert image menu ( like the same number for Height and base ,also I input 0 for base ) but nothing changed!!!!!