It just might be your monitor brightness/contrast/colour settings - the same problem occurs with DVD playback for many people and some of the newer monitors have the facility to temporarily boost brightness to cover such eventualities.
Huawei P10 review
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.