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luminance & intensity

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A question: What''s the diffrence between luminance & intensity in opengl? I think the two are similar. But,for instance,this is the description of a gl function from MSDN: "void glCopyTexImage2D( GLenum target, GLint level, GLenum internalFormat, GLint x, GLint y, GLsizei width, GLsizei height, GLint border );" of which the argument "internalFormat" can be set to GL_LUMINANCE£¬GL_INTENSITY etc. I only found a definition in the red book: "luminance is the weighted sum of the red, green, and blue values ". can anyone tell more? thank you very much!

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