blue              728 http/modules/ngx_http_image_filter_module.c                                    red, green, blue, t;
blue              765 http/modules/ngx_http_image_filter_module.c             blue = gdImageBlue(src, transparent);
blue              775 http/modules/ngx_http_image_filter_module.c     blue = 0;
blue              934 http/modules/ngx_http_image_filter_module.c         gdImageColorTransparent(dst, gdImageColorExact(dst, red, green, blue));