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Half-Tone Comic Shader

A Half-Tone post-processing effect shader that replicates the appearance of old comic books.

Shader code
// Shader By Zacksly - https://zacksly.itch.io/
shader_type canvas_item;
uniform bool UseColor;
uniform bool BlackDot;
uniform float AspectRatio;
uniform float Dots;
uniform float _min;
uniform float _max;
uniform bool UseReshade;

void fragment() {

	vec3 uv_grid = fract(vec3(UV, 0.0) * vec3(AspectRatio * Dots, Dots, 0.0));

	float grid = distance(uv_grid, vec3(0.5, 0.5, 0.5));
	
	vec3 raw_cam_image;
	{
		vec4 _tex_read = textureLod(TEXTURE, UV, 0.0);
		raw_cam_image = _tex_read.rgb;
	}

	vec3 grayscale;
	{
		vec3 c = raw_cam_image;
		float max1 = max(c.r, c.g);
		float max2 = max(max1, c.b);
		float max3 = max(max1, max2);
		grayscale = vec3(max3, max3, max3);
	}

	vec3 clamped = clamp(grayscale, vec3(_min), vec3(_max));

	vec3 inv_clamped = vec3(1.0, 1.0, 1.0) - clamped;

	bool black_dot_grid = grid > dot(inv_clamped, vec3(0.333333, 0.333333, 0.333333));
	bool white_dot_grid = grid < dot(clamped, vec3(0.333333, 0.333333, 0.333333));

	vec3 grid_result;
	if(BlackDot)
	{
		grid_result = vec3(black_dot_grid ? 1.0 : 0.0);
	}
	else
	{
		grid_result = vec3(white_dot_grid ? 1.0 : 0.0);
	}

	vec3 saturated_image;
	saturated_image = vec3(0.0, 0.0, 0.0);
	{
		vec3 c;
		c = raw_cam_image;
		if ( abs(c.r - c.g) > .1 || abs(c.g - c.b) > .1 || abs(c.b - c.r) > .1 ){
			c.rgb = mix(vec3(0.0), c.rgb, 2); //Brightness
			c.rgb = mix(vec3(0.5), c.rgb, 1); // Contrast
			c.rgb = mix(vec3(dot(vec3(1.0), c.rgb)*0.33333), c.rgb, 2); //Saturation
		} else {
			c= vec3(1.0,1.0,1.0);
		}
		
		saturated_image.rgb = c;
	}

	vec3 screen_image;
	if(UseReshade)
	{
		screen_image = saturated_image;
	}
	else
	{
		screen_image = raw_cam_image;
	}

	vec3 final_image;
	if(UseColor)
	{
		final_image = grid_result * screen_image;
	}
	else
	{
		final_image = grid_result;
	}

	COLOR.rgb = final_image;
}
Tags
comic, half-tone, post process, zacksly
The shader code and all code snippets in this post are under CC0 license and can be used freely without the author's permission. Images and videos, and assets depicted in those, do not fall under this license. For more info, see our License terms.

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