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This topic comprises 2 pages: 1 2
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Author
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Topic: Question about 4k
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Leo Enticknap
Film God
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Posts: 7474
From: Loma Linda, CA
Registered: Jul 2000
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posted 08-08-2017 10:03 PM
quote: Jim Cassedy Your BARCO projector will handle 4K content just fine, but it will automatically 'downscale' the image to 2K. Noooo problem!
I can't now remember how I learned this or where, but as I understand it, the JPEG 2000 file structure within the image MXF file(s) in a DCP is such that all DCPs contain the core 2K image data, but 4K DCPs contain extra image data to "fill in the dots," if you will, to complete the 4K frame. The ICP and light engine of a 4K projector playing a 4K DCP will use both sets of data to wiggle the DMD mirrors, but in a 2K projector playing a 4K DCP, the extra "2K to 4K" image data is simply ignored.
So no downscaling takes place when a 2K projector is playing a 4K DCP: the extra 4K image data is ignored, and only the 2K core image data is read and processed.
I'm guessing that this stripping out happens in the server, media block or IMB: in the config setup scripts for most if not all the models I've encountered, you are required to state whether the projector is 2K or 4K.
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Marcel Birgelen
Film God
Posts: 3357
From: Maastricht, Limburg, Netherlands
Registered: Feb 2012
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posted 08-09-2017 01:06 AM
quote: Geoffrey Hudson We are looking into being able to show 4K material, either from DCP or UltraHD discs through one of the external inputs.
I guess you're running a normal cinema operation and regularly play DCPs from common distributors.
In that case, you probably have already played a whole bunch of 4K DCPs without even really noticing.
Obviously, as others have pointed out, your equipment isn't capable of rendering 4K resolutions, simply because the light engine is stuck at a 2K resolution. Like Leo mentioned, the "rendering engine" in your IMS will only extract the "2K part" of the image from the DCP, even though the DCP itself is a 4K DCP.
If you connect a UHD capable Blu-Ray player, it will downscale it to FullHD, because like Carsten already mentioned, the IMS doesn't have the necessary HDMI 2.0 port and will also not handle the required HDCP level.
So, in order to do proper 4K, you have to upgrade your equipment.
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