NOTICE: Selective Color Grading - Port from Photon Shaders
=========================================================

This file documents the port of selective (hue-isolated) color grading
from Photon Shaders into Unbound Visual + PT.

SOURCE PACK:
  Photon Shaders by Benjamin Stott ("SixthSurge")
  Version: v1.3b
  License: Creative Commons Attribution-NonCommercial-ShareAlike 4.0
           International (CC BY-NC-SA 4.0)
  Source files referenced:
    - shaders/program/c14_color_grading.fsh (grade_output, vignette)
    - shaders/include/utility/color.glsl (rgb_to_hsl, hsl_to_rgb, isolate_hue)
    - shaders/include/global.glsl (pulse, cubic_smooth)

PORTED BY:
  EminGT (Unbound Visual + PT author)
  Adapted to Unbound Visual + PT v9.0's pipeline

WHAT WAS PORTED:
  The selective color grading technique - a per-hue isolate-and-boost
  "color blending" system that allows individual hue ranges (orange, teal,
  green, etc.) to be adjusted independently for saturation, hue shift, and
  gain. This is distinct from global vibrance/saturation adjustments.

LICENSE TERMS:
  Photon Shaders is licensed under CC BY-NC-SA 4.0. Under this license:
  - You may share and adapt this material
  - You must give appropriate credit (this notice file)
  - You may NOT use this material for commercial purposes
  - If you remix, transform, or build upon the material, you must
    distribute your contributions under the same license

  This port is an adaptation, not a verbatim copy. The algorithms and
  concepts have been re-implemented to fit Unbound's coordinate system
  and pipeline, but the underlying technique originates from Photon Shaders.

  CC BY-NC-SA 4.0 full text: https://creativecommons.org/licenses/by-nc-sa/4.0/

ATTRIBUTION IN CODE:
  File: lib/colors/selectiveColorGrade.glsl
  Line 2-3: "// Selective (hue-isolated) color grading, ported from Photon Shaders"
            "// (c) 2021-2025 Benjamin Stott ("SixthSurge") - see NOTICE_PHOTON_GRADE_PORT.txt"
