ComfyUI/blueprints/Unsharp Mask.json

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 // amount    [0.0 – 3.0]  typical: 0.5–1.5\nuniform float u_float1;  // radius    [0.5 – 10.0] blur radius in pixels\nuniform float u_float2;  // threshold [0.0 – 0.1]  min difference to sharpen\n\nin vec2 v_texCoord;\nlayout(location = 0) out vec4 fragColor0;\n\nfloat gaussian(float x, float sigma) {\n    return exp(-(x * x) / (2.0 * sigma * sigma));\n}\n\nfloat getLuminance(vec3 color) {\n    return dot(color, vec3(0.2126, 0.7152, 0.0722));\n}\n\nvoid main() {\n    vec2 texel = 1.0 / u_resolution;\n    float radius = max(u_float1, 0.5);\n    float amount = u_float0;\n    float threshold = u_float2;\n    \n    vec4 original = texture(u_image0, v_texCoord);\n    \n    // Gaussian blur for the \"unsharp\" mask\n    int samples = int(ceil(radius));\n    float sigma = radius / 2.0;\n    \n    vec4 blurred = vec4(0.0);\n    float totalWeight = 0.0;\n    \n    for (int x = -samples; x <= samples; x++) {\n        for (int y = -samples; y <= samples; y++) {\n            vec2 offset = vec2(float(x), float(y)) * texel;\n            vec2 sampleCoord = v_texCoord + offset;\n            \n            // Boundary check - skip out-of-bounds samples\n            if (sampleCoord.x < 0.0 || sampleCoord.x > 1.0 ||\n                sampleCoord.y < 0.0 || sampleCoord.y > 1.0) {\n                continue;\n            }\n            \n            float dist = length(vec2(float(x), float(y)));\n            float weight = gaussian(dist, sigma);\n            blurred += texture(u_image0, sampleCoord) * weight;\n            totalWeight += weight;\n        }\n    }\n    blurred /= totalWeight;\n    \n    // Unsharp mask = original - blurred\n    vec3 mask = original.rgb - blurred.rgb;\n    \n    // Luminance-based threshold (Photoshop-style)\n    float lumaDelta = abs(getLuminance(original.rgb) - getLuminance(blurred.rgb));\n    if (lumaDelta < threshold) {\n        mask = vec3(0.0);\n    }\n    \n    // Sharpen: original + mask * amount\n    vec3 sharpened = original.rgb + mask * amount;\n    \n    fragColor0 = vec4(clamp(sharpened, 0.0, 1.0), original.a);\n}\n","from_input"]}],"groups":[],"links":[{"id":41,"origin_id":27,"origin_slot":0,"target_id":26,"target_slot":2,"type":"FLOAT"},{"id":42,"origin_id":28,"origin_slot":0,"target_id":26,"target_slot":3,"type":"FLOAT"},{"id":43,"origin_id":29,"origin_slot":0,"target_id":26,"target_slot":4,"type":"FLOAT"},{"id":39,"origin_id":-10,"origin_slot":0,"target_id":26,"target_slot":0,"type":"IMAGE"},{"id":40,"origin_id":26,"origin_slot":0,"target_id":-20,"target_slot":0,"type":"IMAGE"}],"extra":{"workflowRendererVersion":"LG"}}]}}