glBlendColor
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## Name

glBlendColor — set the blend color

## C Specification

`void `glBlendColor`` | `(` | `GLclampf `red`, GLclampf `green`, GLclampf `blue`, GLclampf `alpha`);`

## Python Specification

``glBlendColor`` | `(` | ``red`, `green`, `blue`, `alpha`) → `None``

## Parameters

`red`, `green`, `blue`, `alpha`
  specify the components of `GL_BLEND_COLOR`

## Description

The `GL_BLEND_COLOR` may be used to calculate the source and destination blending factors. The color components are clamped to the range 0 1 before being stored. See `glBlendFunc` for a complete description of the blending operations. Initially the `GL_BLEND_COLOR` is set to 0 0 0 0 .

## Notes

`glBlendColor` is part of the `GL_ARB_imaging` subset. `glBlendColor` is present only if `GL_ARB_imaging` is returned when `glGetString` is called with `GL_EXTENSIONS` as its argument.

## Errors

`GL_INVALID_OPERATION` is generated if `glBlendColor` is executed between the execution of `glBegin` and the corresponding execution of `glEnd`.

## Associated Gets

`glGet` with an argument of `GL_BLEND_COLOR`

## See Also

glBlendEquation, glBlendFunc, glGetString

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