4. mar 2018, 01:57
#268506
Endnu et citat fra Lightillusion.com artiklen (link ovenfor) :
"Whilst we know and understand that the SDR grading display will have been calibrated to 100 nits, we also understand that it will have been housed in a controlled grading environment, with little ambient light. The beauty of SDR's relative approach to gamma is that the TV can simply be made brighter to overcome uncontrollable light contaminated environments, including the use of different gamma values.
One of the often overlooked potential issues with PQ based HDR for home viewing is that because the standard is 'absolute' there is no way to increase the display's light output to overcome surrounding room light levels - the peak brightness cannot be increased, and neither can the fixed gamma (EOTF) curve.
As mentioned above, with HDR the Average Picture Level (APL) will match that of regular SDR (standard dynamic range) imagery. The result is that in less than ideal viewing environments, where the surrounding room brightness level is relatively high, the bulk of the HDR image will appear very dark, with shadow detail potentially becoming very difficult to see.
To be able to view PQ based 'absolute' HDR imagery environmental light levels will have to be very carefully controlled. Far more so than for SDR viewing. This really does mean using a true home cinema environment. "
"Whilst we know and understand that the SDR grading display will have been calibrated to 100 nits, we also understand that it will have been housed in a controlled grading environment, with little ambient light. The beauty of SDR's relative approach to gamma is that the TV can simply be made brighter to overcome uncontrollable light contaminated environments, including the use of different gamma values.
One of the often overlooked potential issues with PQ based HDR for home viewing is that because the standard is 'absolute' there is no way to increase the display's light output to overcome surrounding room light levels - the peak brightness cannot be increased, and neither can the fixed gamma (EOTF) curve.
As mentioned above, with HDR the Average Picture Level (APL) will match that of regular SDR (standard dynamic range) imagery. The result is that in less than ideal viewing environments, where the surrounding room brightness level is relatively high, the bulk of the HDR image will appear very dark, with shadow detail potentially becoming very difficult to see.
To be able to view PQ based 'absolute' HDR imagery environmental light levels will have to be very carefully controlled. Far more so than for SDR viewing. This really does mean using a true home cinema environment. "
