SourceDithered

Line Screen

Parallel lines whose thickness follows the tone, like an engraving or a banknote. Set the line spacing and angle, let the light lift the lines like an oscilloscope, or make them wave.

Author: Unknown
Year: —
Complexity: low
Processing cost: 2 / 5

Use Line Screen in the editor All algorithms

How it works

A grid of dots or lines, turned to an angle like a print screen, grows with the tone. Screen size, angle and dot shape are adjustable.

Threshold ranks of one 8×8 line cell at 0°
8	8	8	8	8	8	8	8
24	24	24	24	24	24	24	24
40	40	40	40	40	40	40	40
56	56	56	56	56	56	56	56
48	48	48	48	48	48	48	48
32	32	32	32	32	32	32	32
16	16	16	16	16	16	16	16
0	0	0	0	0	0	0	0

The image is crossed by parallel lines 8 pixels apart; each line thickens from its middle as the image gets darker, one row of pixels at a time.
A pixel turns white when its brightness exceeds the threshold at its position; the thresholds rank pixels by their distance to the line center. Ranking pixels as they actually fall on the grid keeps every gray level exact.
In the editor, set the line spacing (4–64 px) and the angle; displacement lifts the lines where the image is bright, and wave ripples them along their length. With dots lighter than the background, the lines mark the light areas instead.