Starting width: px | Starting height: px | Print resolution: ppi Interpolated image size in px 0 x step 10% 20% 1 x x 2 x x 3 x x 4 x x 5 x x 6 x x 7 x x 8 x x 9 x x 10 x x Interpolated image size in cm 0 x step 10% 20% 1 x x 2 x x 3 x x 4 x x 5 x x 6 x x 7 x x 8 x x 9 x x 10 x x Original idea: NickGallery | Photoshop action for stair interpolation