Use full range output for image

MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs

@@ -737,12 +737,12 @@ namespace MediaBrowser.MediaEncoding.Encoder
                 {
                     var peak = videoStream.VideoRangeType == VideoRangeType.DOVI ? "400" : "100";
                     enableHdrExtraction = true;
-                    filters.Add($"tonemapx=tonemap=bt2390:desat=0:peak={peak}:t=bt709:m=bt709:p=bt709:format=yuv420p");
+                    filters.Add($"tonemapx=tonemap=bt2390:desat=0:peak={peak}:t=bt709:m=bt709:p=bt709:format=yuv420p:range=full");
                 }
                 else if (SupportsFilter("zscale") && videoStream.VideoRangeType != VideoRangeType.DOVI)
                 {
                     enableHdrExtraction = true;
-                    filters.Add("zscale=t=linear:npl=100,format=gbrpf32le,zscale=p=bt709,tonemap=tonemap=hable:desat=0:peak=100,zscale=t=bt709:m=bt709,format=yuv420p");
+                    filters.Add("zscale=t=linear:npl=100,format=gbrpf32le,zscale=p=bt709,tonemap=tonemap=hable:desat=0:peak=100,zscale=t=bt709:m=bt709:out_range=full,format=yuv420p");
                 }
             }