ComfyUI/blueprints/Color Curves.json

{"revision": 0,"last_node_id": 10,"last_link_id": 0,"nodes": [{"id": 10,"type": "d5c462c8-1372-4af8-84f2-547c83470d04","pos": [3610,-2630],"size": [270,420],"flags": {},"order": 0,"mode": 0,"inputs": [{"label": "image","localized_name": "images.image0","name": "images.image0","type": "IMAGE","link": null}],"outputs": [{"label": "IMAGE","localized_name": "IMAGE0","name": "IMAGE0","type": "IMAGE","links": []}],"properties": {"proxyWidgets": [["4","curve"],["5","curve"],["6","curve"],["7","curve"]]},"widgets_values": [],"title": "Color Curves"}],"links": [],"version": 0.4,"definitions": {"subgraphs": [{"id": "d5c462c8-1372-4af8-84f2-547c83470d04","version": 1,"state": {"lastGroupId": 0,"lastNodeId": 8,"lastLinkId": 33,"lastRerouteId": 0},"revision": 0,"config": {},"name": "Color Curves","inputNode": {"id": -10,"bounding": [2660,-4500,120,60]},"outputNode": {"id": -20,"bounding": [4270,-4500,120,60]},"inputs": [{"id": "abc345b7-f55e-4f32-a11d-3aa4c2b0936b","name": "images.image0","type": "IMAGE","linkIds": [29],"localized_name": "images.image0","label": "image","pos": [2760,-4480]}],"outputs": [{"id": "eb0ec079-46da-4408-8263-9ef85569d33d","name": "IMAGE0","type": "IMAGE","linkIds": [28],"localized_name": "IMAGE0","label": "IMAGE","pos": [4290,-4480]}],"widgets": [],"nodes": [{"id": 4,"type": "CurveEditor","pos": [3060,-4500],"size": [270,200],"flags": {},"order": 0,"mode": 0,"inputs": [{"label": "curve","localized_name": "curve","name": "curve","type": "CURVE","widget": {"name": "curve"},"link": null},{"label": "histogram","localized_name": "histogram","name": "histogram","type": "HISTOGRAM","shape": 7,"link": null}],"outputs": [{"localized_name": "CURVE","name": "CURVE","type": "CURVE","links": [30]}],"title": "RGB Master","properties": {"Node name for S&R": "CurveEditor"},"widgets_values": []},{"id": 5,"type": "CurveEditor","pos": [3060,-4250],"size": [270,200],"flags": {},"order": 1,"mode": 0,"inputs": [{"label": "curve","localized_name": "curve","name": "curve","type": "CURVE","widget": {"name": "curve"},"link": null},{"label": "histogram","localized_name": "histogram","name": "histogram","type": "HISTOGRAM","shape": 7,"link": null}],"outputs": [{"localized_name": "CURVE","name": "CURVE","type": "CURVE","links": [31]}],"title": "Red","properties": {"Node name for S&R": "CurveEditor"},"widgets_values": []},{"id": 6,"type": "CurveEditor","pos": [3060,-4000],"size": [270,200],"flags": {},"order": 2,"mode": 0,"inputs": [{"label": "curve","localized_name": "curve","name": "curve","type": "CURVE","widget": {"name": "curve"},"link": null},{"label": "histogram","localized_name": "histogram","name": "histogram","type": "HISTOGRAM","shape": 7,"link": null}],"outputs": [{"localized_name": "CURVE","name": "CURVE","type": "CURVE","links": [32]}],"title": "Green","properties": {"Node name for S&R": "CurveEditor"},"widgets_values": []},{"id": 7,"type": "CurveEditor","pos": [3060,-3750],"size": [270,200],"flags": {},"order": 3,"mode": 0,"inputs": [{"label": "curve","localized_name": "curve","name": "curve","type": "CURVE","widget": {"name": "curve"},"link": null},{"label": "histogram","localized_name": "histogram","name": "histogram","type": "HISTOGRAM","shape": 7,"link": null}],"outputs": [{"localized_name": "CURVE","name": "CURVE","type": "CURVE","links": [33]}],"title": "Blue","properties": {"Node name for S&R": "CurveEditor"},"widgets_values": []},{"id": 8,"type": "GLSLShader","pos": [3590,-4500],"size": [420,500],"flags": {},"order": 4,"mode": 0,"inputs": [{"label": "image0","localized_name": "images.image0","name": "images.image0","type": "IMAGE","link": 29},{"label": "image1","localized_name": "images.image1","name": "images.image1","shape": 7,"type": "IMAGE","link": null},{"label": "u_curve0","localized_name": "curves.u_curve0","name": "curves.u_curve0","shape": 7,"type": "CURVE","link": 30},{"label": "u_curve1","localized_name": "curves.u_curve1","name": "curves.u_curve1","shape": 7,"type": "CURVE","link": 31},{"label": "u_curve2","localized_name": "curves.u_curve2","name": "curves.u_curve2","shape": 7,"type": "CURVE","link": 32},{"label": "u_curve3","localized_name": "curves.u_curve3","name": "curves.u_curve3","shape": 7,"type": "CURVE","link": 33},{"localized_name": "fragment_shader","name": "fragment_shader","type": "STRING","widget": {"name": "fragment_shader"},"link": null},{"localized_name": "size_mode","name": "size_mode","type": "COMFY_DYNAMICCOMBO_V3","widget": {"name": "size_mode"},"link": null}],"outputs": [{"localized_name": "IMAGE0","name": "IMAGE0","type": "IMAGE","links": [28]},{"localized_name": "IMAGE1","name": "IMAGE1","type": "IMAGE","links": null},{"localized_name": "IMAGE2","name": "IMAGE2","type": "IMAGE","links": null},{"localized_name": "IMAGE3","name": "IMAGE3","type": "IMAGE","links": null}],"properties": {"Node name for S&R": "GLSLShader"},"widgets_values": ["#version 300 es\nprecision highp float;\n\nuniform sampler2D u_image0;\nuniform sampler2D u_curve0;  // RGB master curve (256x1 LUT)\nuniform sampler2D u_curve1;  // Red channel curve\nuniform sampler2D u_curve2;  // Green channel curve\nuniform sampler2D u_curve3;  // Blue channel curve\n\nin vec2 v_texCoord;\nlayout(location = 0) out vec4 fragColor0;\n\n// GIMP-compatible curve lookup with manual linear interpolation.\n// Matches gimp_curve_map_value_inline() from gimpcurve-map.c:\n//   index = value * (n_samples - 1)\n//   f = fract(index)\n//   result = (1-f) * samples[floor] + f * samples[ceil]\n//\n// Uses texelFetch (NEAREST) to avoid GPU half-texel offset issues\n// that occur with texture() + GL_LINEAR on small 256x1 LUTs.\nfloat applyCurve(sampler2D curve, float value) {\n    value = clamp(value, 0.0, 1.0);\n\n    float pos = value * 255.0;\n    int lo = int(floor(pos));\n    int hi = min(lo + 1, 255);\n    float f = pos - float(lo);\n\n    float a = texelFetch(curve, ivec2(lo, 0), 0).r;\n    float b = texelFetch(curve, ivec2(hi, 0), 0).r;\n\n    return a + f * (b - a);\n}\n\nvoid main() {\n    vec4 color = texture(u_image0, v_texCoord);\n\n    // GIMP order: per-channel curves first, then RGB master curve.\n    // See gimp_curve_map_pixels() default case in gimpcurve-map.c:\n    //   dest = colors_curve( channel_curve( src ) )\n    float tmp_r = applyCurve(u_curve1, color.r);\n    float tmp_g = applyCurve(u_curve2, color.g);\n    float tmp_b = applyCurve(u_curve3, color.b);\n    color.r = applyCurve(u_curve0, tmp_r);\n    color.g = applyCurve(u_curve0, tmp_g);\n    color.b = applyCurve(u_curve0, tmp_b);\n\n    fragColor0 = vec4(color.rgb, color.a);\n}\n","from_input"]}],"groups": [],"links": [{"id": 29,"origin_id": -10,"origin_slot": 0,"target_id": 8,"target_slot": 0,"type": "IMAGE"},{"id": 28,"origin_id": 8,"origin_slot": 0,"target_id": -20,"target_slot": 0,"type": "IMAGE"},{"id": 30,"origin_id": 4,"origin_slot": 0,"target_id": 8,"target_slot": 2,"type": "CURVE"},{"id": 31,"origin_id": 5,"origin_slot": 0,"target_id": 8,"target_slot": 3,"type": "CURVE"},{"id": 32,"origin_id": 6,"origin_slot": 0,"target_id": 8,"target_slot": 4,"type": "CURVE"},{"id": 33,"origin_id": 7,"origin_slot": 0,"target_id": 8,"target_slot": 5,"type": "CURVE"}],"extra": {"workflowRendererVersion": "LG"},"category": "Image Tools/Color adjust"}]}}