id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
53	Color grading	gongminmin	gongminmin	"Add color grading post process, including rendering and tools.

Color grading is very important for high quality rendering. The kernel of it is a look-up table that transform a LDR RGB color to another. The look-up table can be store in a 16x16x16 3D texture. Use RGB as coordinate to do the looking up.

The editing process has 3 steps:
1. Generate a identity look-up table. The output is the same as input. It's a 2D image with 16x256, flatten the Z dimension.
2. Capture a frame in game, tune it's RGB curves inside image processing tools, such as PhotoShop.
3. Apply the tuned RGB curves to the identity look-up table image.
4. Pack the 2D image to 3D volume texture.

So what we need is as these:
1. A color grading post process.
2. A tool to generate a identity look-up table.
3. A tool to pack that table into 3D.
The tool in 2 and 3 can be done by one single tool with different command lines."	task	closed	major	4.0.0	Core-Rendering system		fixed