Hacker News: drumdude

New comment by drumdude in "Where to Find the Colors Your Screen Can't Show You"

drumdude — Sat, 20 Jun 2026 20:02:52 +0000

Cinema RGB laser projectors are around $50,000. The cheaper non cinema versions are probably around $20,000.

New comment by drumdude in "TV backlight compensation (2020)"

drumdude — Thu, 06 Oct 2022 18:23:52 +0000

The camera handles everything automatically. It generates dynamic patterns on the screen and adjusts several times until it is satisfied with the result. It does this for red, green, blue, and white across 10IRE, 20IRE, ect up to 100IRE. The LUT is human readable and able to be uploaded and downloaded from the FPGA.

New comment by drumdude in "TV backlight compensation (2020)"

drumdude — Thu, 06 Oct 2022 07:46:53 +0000

I do this for a living. Sony digital cinema projectors use a type of LCD panel (SXRD) where the uniformity drifts over time. A special camera takes about 35 minutes to create a LUT to restore the projected image to a uniform white.