GD Grader

GD Grader

A Godot 4 tool for tweaking image color and exporting the result as a LUT (Look-Up Table) PNG, ready to use with Godot's `WorldEnvironment` adjustment system.

Features

• Load any PNG / JPG / WebP image as a reference
•  Real-time corrected preview via shader
• Tone controls, Exposure, Contrast, Brightness
•  Color controls, Saturation, Hue Shift, Temperature
•  Lift / Gamma / Gain (ASC CDL)
• Per-channel RGB curves editor with histogram
• Export a 512×512 Godot-compatible LUT PNG

Usage

• Run the scene and click LOAD IMAGE to load a reference image.
• Adjust sliders and curves until the corrected preview looks right.
• Click EXPORT LUT and save the PNG somewhere in your project.
• Import LUT png in Godot, enable adjustment under environment. 
• When importing LUT png make sure to select texture 3D in import setting and slice horizontal 16 and vertical 1