6037    double   redf, greenf, bluef, alphaf;  member
6047    this->redf = this->red / (double)rMax;  in image_pixel_setf()
6053       this->rede = this->redf * DBL_EPSILON;  in image_pixel_setf()
6447    that->red = sample_scale(that->redf, scale);  in image_transform_mod_end()
6484       that->bluef = that->greenf = that->redf;  in image_transform_mod_end()
6883             transform_range_check(pp, r, g, b, a, in_pixel.red, in_pixel.redf,  in transform_image_validate()
7938          r = rlo = rhi = that->redf;  in image_transform_png_set_rgb_to_gray_mod()
8079          double r = that->redf;  in image_transform_png_set_rgb_to_gray_mod()
8207       that->bluef = that->greenf = that->redf = gray;  in image_transform_png_set_rgb_to_gray_mod()
8337          that->redf = data.redf;  in image_transform_png_set_background_mod()
8354          that->redf = that->redf * that->alphaf + data.redf * alf;  in image_transform_png_set_background_mod()