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-rw-r--r--src/blind-square-gradient.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/blind-square-gradient.c b/src/blind-square-gradient.c
index 3a754a2..8032476 100644
--- a/src/blind-square-gradient.c
+++ b/src/blind-square-gradient.c
@@ -34,6 +34,7 @@ main(int argc, char *argv[])
eopen_stream(&stream, NULL);
SELECT_PROCESS_FUNCTION(&stream);
+ CHECK_N_CHAN(&stream, 4, 4);
if (stream.width > 3 || stream.height > 3 ||
stream.width * stream.height < 2 ||