tester.add_input(data, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_sRGB);
tester.get_chain()->add_effect(new IdentityEffect());
tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_sRGB);
tester.add_input(data, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_sRGB);
tester.get_chain()->add_effect(new IdentityEffect());
tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_sRGB);