Color Theory/HDR

HDR DR Dynamic range (DR): HDR workflows: ITU vs ICC by Luke Wallis is the ratio between the largest and smallest values that a certain quantity can assume. It is often used in the context of signals, like sound and light. That technology also improves other aspects of transmitted images, such as color gamut The maximum contrast of an image is the contrast ratio or dynamic range types of DR: LDR = low DR SDR (Standard Dynamic Range): 0.05 nits - 100 nits HDR (High Dynamic Range): 0.0005 nits - 10,000 nits. Also known as wide dynamic range, extended dynamic range, or expanded dynamic range, is a dynamic range higher than usual. Human DR: Human vision: can detect brightness levels as low as 0.000001 nits and as high as 100,000,000 nits The candela per square metre is the unit of liminance in the International System of Units . The nit (symbol: nt) is a non-SI name also used for this unit Vision Pierre Buser Michel Imbert MIT Press 1992 978-0-262-02336-8 53 https://archive.org/details/vision0000buse registration nit luminance. Astronomical Photometry RLF Boyd Springer 1992 978-0-7923-1653-4 9 https://books.google.com/books?id=ojzepXhy9DIC&q=nitere+nit+luminance&pg=PA9 1 nt = 1 cd/m2 Defining HDR image and image sequence formats and attributes Peak luminance White points Contrast – spatial and temporal Dark levels 3 levels of monitor brightness: a low brightness if they have a peak brightness below 300 nits a standard brightness if they have a peak brightness between 300 and 350 nits (SDR) a high brightness if they have a peak brightness above 350 nits ( HDR ) + Dynamic ranges of common devices Device Stops Contrast ratio Glossy photograph paper 7 (7–7 2 3) 128:1 LCD 9.5 (9-11)https://www.zdnet.com/home-and-office/work-life/high-dynamic-range-the-quest-for-greater-image-realism/ Terry Relph-Knight July 16, 2018 High Dynamic Range: The quest for greater image realism ZD Net 2022-12-25 700:1 (500:12000:1) Typical cellphone camera ~10https://luminous-landscape.com/of-phones-pixels-and-photons-why-a-100-mp-cell-phone-is-not-a-gfx-100/ Of Phones, Pixels and Photons – why a 100 mp cell phone is not a GFX 100 - Luminous Landscape 2021-04-27Source talks about a 108 MP phone and claims it is not useful. Makes some statements about useful resolution for phones but what we really need is a survey and summary of current phone capabilities. LMK if I've missed something. April 2023 varies Negative film (Kodak VISION3) 13 8000:1 Human eye 10–14 1000:116000:1 OLED or quantum dot 13.2-20.9https://www.archivalworks.com/blog/hdr-nits-are-a-lie-embrace-the-stop HDR Nits are a Lie: It's Time to Embrace the Stop Brian Wagner July 2, 2020 2022-12-25December 2022 9500:12000000:1 High-end DSLR camera (Nikon D850) 14.8 28500:1 Digital cinema camera (Red Weapon 8k) > 16.5https://www.dxomark.com/Reviews/RED-Helium-8K-DxOMark-Sensor-Score-108-A-new-all-time-high-score2 Red Weapon 8k Rating by DxOMark live https://web.archive.org/web/20170619041130/https://www.dxomark.com/Reviews/RED-Helium-8K-DxOMark-Sensor-Score-108-A-new-all-time-high-score2 2017-06-19 2017-01-10 92000:1 Minimum peak luminance (Brightness in cd/m2) Range of color (Color gamut)Minimum Color depth Typical dimming technology Maximum black level luminance (Brightness in cd/m2) Maximum backlight adjustment latency (Number of video frames) DisplayHDR 400 400 sRGB8 bit (24-bit) Screen-level 0.4 8 DisplayHDR 500 500 WCG* 10-bit (30-bit) Zone-level 0.1 8 DisplayHDR 600 600 WCG* Zone-level 0.1 8 DisplayHDR 1000 1000 WCG* Zone-level 0.05 8 DisplayHDR 1400 1400 WCG* Zone-level 0.02 8 DisplayHDR 400 True Black 400 WCG Pixel-level 0.0005 2 DisplayHDR 500 True Black 500 WCG Pixel-level 0.0005 2DisplayHDR 600 True Black600WCGPixel-level0.00052 High dynamic range (HDR) HDR rendering HDR TV HDR HDRI = High dynamic range imaging. The set of imaging technologies and techniques that allow to increase the dynamic range of images or videos. It covers the acquisition, creation, storage, distribution and display of images and videos HDRR = High-dynamic-range renderingHigh-dynamic-range rendering in wikipedia HDRP = HIGH DEFINITION RENDER PIPELINE HDR display HDR file formats formats Formats that are only used for HDR storage purpose: AVIF Raw image formats Formats that use a linear transfer function with high bit-depth Formats that use a logarithmic transfer function OpenEXR ACES HDR formats that can be used for both storage and transmission to displays, such as: HDR10 HDR10+ Dolby Vision HLG programs HDRI / Radiance image processing algorithms for Python piccante: The hottest High Dynamic Range (HDR) Library links High Dynamic Range Explained by Eric Chan 10-10-2023 displayhdr.org Learn OpenGL: HDR hdr-faq by ARRI greg benz photography: hdr Towards an HDR-capable ICC PCS by Chris Lilley World Wide Web Consortium (W3C) June 2020 References