6037    double   redf, greenf, bluef, alphaf;  member
6049    this->bluef = this->blue / (double)bMax;  in image_pixel_setf()
6061       this->bluee = this->bluef * DBL_EPSILON;  in image_pixel_setf()
6474       that->blue = sample_scale(that->bluef, scale);  in image_transform_mod_end()
6484       that->bluef = that->greenf = that->redf;  in image_transform_mod_end()
6897             transform_range_check(pp, r, g, b, a, in_pixel.blue, in_pixel.bluef,  in transform_image_validate()
7950          b = blo = bhi = that->bluef;  in image_transform_png_set_rgb_to_gray_mod()
8083          double b = that->bluef;  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()
8339          that->bluef = data.bluef;  in image_transform_png_set_background_mod()
8360          that->bluef = that->bluef * that->alphaf + data.bluef * alf;  in image_transform_png_set_background_mod()