Originally Posted by sspears
If I were going to try and measure the resolution of content, I would do it on the content itself. Rip it off the disc and keep it in its native 4:2:0 format. Then perform an analysis on Y as well as CbCr and then possibly convert to RGB and measure again.
Thanks, Stacey. This approach seems akin to the free-software spectrum analysis post
from dr1394 some 9 years back. The follow-on post shows the stadium-crowd scene frame he analyzed by computer.
My interest, though, is determining the effective resolution of specific details within frames--details that give split-second clues to the eye that you're seeing maximum resolutions; not--as an aside--boosted sharpness, which AIUI is greater contrast between coarse details
within a scene or frame.
Obviously different details will catch the attention of different viewers. I used the content of the 4k-DI Blu-ray "The Tree of Life" as it appears on my viewing setup, without computer signal processing. But, hey, if there's software for my semi-ancient Dell desktop that'll scan a Blu-ray file for frames with maximum resolution, store the frame numbers, display the frame images, then let me cursor-move a rectangle over the finest details and display their resolution, that would be great if it's accurate.
If my technique of measuring, with a loupe or millimeter ruler, the on-screen widths of the higest-resolution details that catch my eye, then match them to similar multiburst widths isn't accurate, well...never mind then. :-) -- John