respecify a portion of a color table
glCopyColorSubTable( GLenum ( target ) , GLsizei ( start ) , GLint ( x ) , GLint ( y ) , GLsizei ( width ) )-> void
glCopyColorSubTable is used to respecify a contiguous portion of a color table previously defined using glColorTable . The pixels copied from the framebuffer replace the portion of the existing table from indices start to , inclusive. This region may not include any entries outside the range of the color table, as was originally specified. It is not an error to specify a subtexture with width of 0, but such a specification has no effect.
GL_INVALID_VALUE is generated if target is not a previously defined color table.
GL_INVALID_VALUE is generated if target is not one of the allowable values.
GL_INVALID_VALUE is generated if .
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