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-rw-r--r--DOCS/man/en/vo.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/DOCS/man/en/vo.rst b/DOCS/man/en/vo.rst
index 251e71ce03..079e146f8a 100644
--- a/DOCS/man/en/vo.rst
+++ b/DOCS/man/en/vo.rst
@@ -708,6 +708,9 @@ image
png-compression=<0-9>
PNG compression factor (speed vs. file size tradeoff) (default: 7)
+ png-filter=<0-5>
+ Filter applied prior to PNG compression (0 = none; 1 = sub; 2 = up;
+ 3 = average; 4 = Paeth; 5 = mixed) (default: 5)
jpeg-quality=<0-100>
JPEG quality factor (default: 90)
[no-]jpeg-progressive