From 9b1b653f1a169dae3e939c58d73356ff02e5835c Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Thu, 28 Jan 2021 22:27:40 +0100
Subject: Use 1 guard bit in JPEG2000 encoding for 2K, per Bv2.1.

---
 src/j2k_transcode.cc | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src')

diff --git a/src/j2k_transcode.cc b/src/j2k_transcode.cc
index b9ebe6c3..dafe8fdf 100644
--- a/src/j2k_transcode.cc
+++ b/src/j2k_transcode.cc
@@ -308,6 +308,7 @@ dcp::compress_j2k (shared_ptr<const OpenJPEGImage> xyz, int bandwidth, int frame
 	parameters.max_comp_size = parameters.max_cs_size / 1.25;
 	parameters.tcp_numlayers = 1;
 	parameters.tcp_mct = 1;
+	parameters.numgbits = fourk ? 2 : 1;
 
 	/* Setup the encoder parameters using the current image and user parameters */
 	opj_setup_encoder (encoder, &parameters, xyz->opj_image());
-- 
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