Appearance
sys-HDR writeup
So... I got High Dynamic Range (HDR) working on Switch 1*
*Pseudo HDR via tone mapping and color curve tricks
So, there is a tool that can adjust display color known as Fizeau. It's well established and overall a cool homebrew. Fizeau adjusts colors using the Tegra X1's Color Management Unit (CMU), using it to apply a variety of static and linear effects.
However, the CMU is far more capable than that. nVidia states that it can do: • Gamma (tone curve) conversion • Color gamut conversion • Allow conversion of sRGB content for a non-sRGB panel, for predictable colors (color matching) • Enhanced PRISM2 display for these panels, as the PRISM2 algorithm assumes sRGB gamma • Enable TCON and panels with non sRGB response • Allows color calibrated displays, and enables end-to-end Camera / ISP -> Display color quality
It's a pretty powerful piece of hardware, and can adjust the color tone curves. This feature allows us to do pseudo-HDR.
So that's what sys-HDR does. It modifies the tone curves to fake HDR. (this is similar to what the Switch2 does actually, although S2 will get a better output. Perhaps in future version I can look into matching S2)
There are various algorithms implemented, those allowing tuning of the curves, which can make a huge difference in games. No photo will ever do justice to how good it looks in person. Here's some games with sys-HDR on/off — drag the slider to compare.
⇔
HDR off
HDR on
⇔
HDR off
HDR on
⇔
HDR off
HDR on