Jony
ba920f2b66
Replace the prior release tree with the current plugin, frontend, tests, and documentation. Document retired node IDs and the public Gitea update source.
440 lines
12 KiB
JSON
440 lines
12 KiB
JSON
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"widgets_values": [],
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"title": "Brightness and Contrast"
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"outputs": [
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{
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"localized_name": "IMAGE0",
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"name": "IMAGE0",
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"type": "IMAGE",
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]
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},
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{
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"name": "IMAGE1",
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"type": "IMAGE",
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"properties": {
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},
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"#version 300 es\nprecision highp float;\n\nuniform sampler2D u_image0;\nuniform float u_float0; // Brightness slider -100..100\nuniform float u_float1; // Contrast slider -100..100\n\nin vec2 v_texCoord;\nout vec4 fragColor;\n\nconst float MID_GRAY = 0.18; // 18% reflectance\n\n// sRGB gamma 2.2 approximation\nvec3 srgbToLinear(vec3 c) {\n return pow(max(c, 0.0), vec3(2.2));\n}\n\nvec3 linearToSrgb(vec3 c) {\n return pow(max(c, 0.0), vec3(1.0/2.2));\n}\n\nfloat mapBrightness(float b) {\n return clamp(b / 100.0, -1.0, 1.0);\n}\n\nfloat mapContrast(float c) {\n return clamp(c / 100.0 + 1.0, 0.0, 2.0);\n}\n\nvoid main() {\n vec4 orig = texture(u_image0, v_texCoord);\n\n float brightness = mapBrightness(u_float0);\n float contrast = mapContrast(u_float1);\n\n vec3 lin = srgbToLinear(orig.rgb);\n\n lin = (lin - MID_GRAY) * contrast + brightness + MID_GRAY;\n\n // Convert back to sRGB\n vec3 result = linearToSrgb(clamp(lin, 0.0, 1.0));\n\n fragColor = vec4(result, orig.a);\n}\n",
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"from_input"
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]
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}
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}
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"extra": {
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"workflowRendererVersion": "LG"
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},
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"category": "Image Tools/Color adjust",
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"description": "Adjusts image brightness and contrast using a real-time GPU fragment shader."
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}
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]
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},
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"extra": {}
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} |