[HELP] Unwanted change of contrast

[Selur]

(Assuming you didn't do any range conversion or changed the levels.)
That depends,...

colour_description_present_Source        : Container / Stream
Color range                              : Limited
colour_range_Source                      : Container
colour_range_Original                    : Full

if the container (= Color range 'Limited') is correct: Yes
if the stream (= Color range 'Full') is correct: No

Cu Selur