OpenGL.WGL.EXT.framebuffer_sRGB

OpenGL extension EXT.framebuffer_sRGB

This module customises the behaviour of the OpenGL.raw.WGL.EXT.framebuffer_sRGB to provide a more Python-friendly API

Overview (from the spec)

Conventionally, OpenGL assumes framebuffer color components are stored in a linear color space. In particular, framebuffer blending is a linear operation.

The sRGB color space is based on typical (non-linear) monitor characteristics expected in a dimly lit office. It has been standardized by the International Electrotechnical Commission (IEC) as IEC 61966-2-1. The sRGB color space roughly corresponds to 2.2 gamma correction.

This extension adds a framebuffer capability for sRGB framebuffer update and blending. When blending is disabled but the new sRGB updated mode is enabled (assume the framebuffer supports the capability), high-precision linear color component values for red, green, and blue generated by fragment coloring are encoded for sRGB prior to being written into the framebuffer. When blending is enabled along with the new sRGB update mode, red, green, and blue framebuffer color components are treated as sRGB values that are converted to linear color values, blended with the high-precision color values generated by fragment coloring, and then the blend result is encoded for sRGB just prior to being written into the framebuffer.

The primary motivation for this extension is that it allows OpenGL applications to render into a framebuffer that is scanned to a monitor configured to assume framebuffer color values are sRGB encoded. This assumption is roughly true of most PC monitors with default gamma correction. This allows applications to achieve faithful color reproduction for OpenGL rendering without adjusting the monitor's gamma correction.

The official definition of this extension is available here: http://www.opengl.org/registry/specs/EXT/framebuffer_sRGB.txt