Creating a 4K test DCP
Posted: Thu Aug 01, 2019 5:34 am
I've been trying to make a 4K test DCP to check that my playlist is in fact in that mode (Doremi Showvault/Christie CP4220).
The process began with an apparently quite good test graphic from someone who tried the same idea via FilmTech. It shows alternating black and white lines, each 1 pixel wide with a resolution of 4096x2160 (attached).
When this file is viewed on my 1920x1080 monitor at full screen it shows an smooth mid-grey rectangle. Viewed at Actual size the vertical lines are apparent.
The theory was that resulting DCP should behave similarly with a even grey when screened at 2K and visible lines when at 4K (viewed, of course, from close up).
Trouble is that no matter what I do the DCP as output from DOM is always a smooth even grey - 4K, 250mbits per sec, Full container selected as output parameters.
So I tried viewing the resulting DCP in DOM on my monitor and here it appears as an even grey. The original file's vertical lines are in clearly visible in the DOM monitor window.
So does any one have any idea of what is happening? Is perhaps the 4K encode not able to resolve such fine detail?
Alan Butterfield
The process began with an apparently quite good test graphic from someone who tried the same idea via FilmTech. It shows alternating black and white lines, each 1 pixel wide with a resolution of 4096x2160 (attached).
When this file is viewed on my 1920x1080 monitor at full screen it shows an smooth mid-grey rectangle. Viewed at Actual size the vertical lines are apparent.
The theory was that resulting DCP should behave similarly with a even grey when screened at 2K and visible lines when at 4K (viewed, of course, from close up).
Trouble is that no matter what I do the DCP as output from DOM is always a smooth even grey - 4K, 250mbits per sec, Full container selected as output parameters.
So I tried viewing the resulting DCP in DOM on my monitor and here it appears as an even grey. The original file's vertical lines are in clearly visible in the DOM monitor window.
So does any one have any idea of what is happening? Is perhaps the 4K encode not able to resolve such fine detail?
Alan Butterfield