Update MS-SSIM tuning

Change optimization parameters when tuning for MS-SSIM for better
performance

Author: fbossen

cjpeg.c

@@ -491,9 +491,9 @@ parse_switches (j_compress_ptr cinfo, int argc, char **argv,
       jpeg_set_quality(cinfo, 75, TRUE);
 
     } else if (keymatch(arg, "tune-ms-ssim", 6)) {
-      cinfo->use_flat_quant_tbl = TRUE;
-      cinfo->lambda_log_scale1 = 10.5;
-      cinfo->lambda_log_scale2 = 13.0;
+      cinfo->use_flat_quant_tbl = FALSE;
+      cinfo->lambda_log_scale1 = 14.25;
+      cinfo->lambda_log_scale2 = 12.75;
       cinfo->use_lambda_weight_tbl = TRUE;
       jpeg_set_quality(cinfo, 75, TRUE);