Can I use a grayscale image with the OpenGL glTexImage2D function?

Question

I have a texture which has only 1 channel as it\'s a grayscale image. When I pass the pixels in to glTexImage2D, it comes out red (obviously because channel 1 is red; RGB).<

Answer 1

Change it to GL_LUMINANCE. See http://www.opengl.org/documentation/specs/man_pages/hardcopy/GL/html/gl/teximage2d.html