COMPOSITION
DESIGN
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Magic Carpet by artist Daniel WurtzelRead more: Magic Carpet by artist Daniel Wurtzelhttps://www.youtube.com/watch?v=1C_40B9m4tI http://www.danielwurtzel.com 
COLOR
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What light is best to illuminate gems for resaleRead more: What light is best to illuminate gems for resalewww.palagems.com/gem-lighting2 Artificial light sources, not unlike the diverse phases of natural light, vary considerably in their properties. As a result, some lamps render an object’s color better than others do. The most important criterion for assessing the color-rendering ability of any lamp is its spectral power distribution curve. Natural daylight varies too much in strength and spectral composition to be taken seriously as a lighting standard for grading and dealing colored stones. For anything to be a standard, it must be constant in its properties, which natural light is not. For dealers in particular to make the transition from natural light to an artificial light source, that source must offer: 
 1- A degree of illuminance at least as strong as the common phases of natural daylight.
 2- Spectral properties identical or comparable to a phase of natural daylight.A source combining these two things makes gems appear much the same as when viewed under a given phase of natural light. From the viewpoint of many dealers, this corresponds to a naturalappearance. The 6000° Kelvin xenon short-arc lamp appears closest to meeting the criteria for a standard light source. Besides the strong illuminance this lamp affords, its spectrum is very similar to CIE standard illuminants of similar color temperature.   
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Tobia Montanari – Memory Colors: an essential tool for ColoristsRead more: Tobia Montanari – Memory Colors: an essential tool for Coloristshttps://www.tobiamontanari.com/memory-colors-an-essential-tool-for-colorists/ “Memory colors are colors that are universally associated with specific objects, elements or scenes in our environment. They are the colors that we expect to see in specific situations: these colors are based on our expectation of how certain objects should look based on our past experiences and memories. For instance, we associate specific hues, saturation and brightness values with human skintones and a slight variation can significantly affect the way we perceive a scene. Similarly, we expect blue skies to have a particular hue, green trees to be a specific shade and so on. Memory colors live inside of our brains and we often impose them onto what we see. By considering them during the grading process, the resulting image will be more visually appealing and won’t distract the viewer from the intended message of the story. Even a slight deviation from memory colors in a movie can create a sense of discordance, ultimately detracting from the viewer’s experience.” 
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Yasuharu YOSHIZAWA – Comparison of sRGB vs ACREScg in NukeRead more: Yasuharu YOSHIZAWA – Comparison of sRGB vs ACREScg in NukeAnswering the question that is often asked, “Do I need to use ACEScg to display an sRGB monitor in the end?” (Demonstration shown at an in-house seminar) 
 Comparison of scanlineRender output with extreme color lights on color charts with sRGB/ACREScg in color – OCIO -working space in NukeDownload the Nuke script: 
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Scientists claim to have discovered ‘new colour’ no one has seen before: OloRead more: Scientists claim to have discovered ‘new colour’ no one has seen before: Olohttps://www.bbc.com/news/articles/clyq0n3em41o By stimulating specific cells in the retina, the participants claim to have witnessed a blue-green colour that scientists have called “olo”, but some experts have said the existence of a new colour is “open to argument”. The findings, published in the journal Science Advances on Friday, have been described by the study’s co-author, Prof Ren Ng from the University of California, as “remarkable”.  (A) System inputs. (i) Retina map of 103 cone cells preclassified by spectral type (7). (ii) Target visual percept (here, a video of a child, see movie S1 at 1:04). (iii) Infrared cellular-scale imaging of the retina with 60-frames-per-second rolling shutter. Fixational eye movement is visible over the three frames shown. (B) System outputs. (iv) Real-time per-cone target activation levels to reproduce the target percept, computed by: extracting eye motion from the input video relative to the retina map; identifying the spectral type of every cone in the field of view; computing the per-cone activation the target percept would have produced. (v) Intensities of visible-wavelength 488-nm laser microdoses at each cone required to achieve its target activation level. (C) Infrared imaging and visible-wavelength stimulation are physically accomplished in a raster scan across the retinal region using AOSLO. By modulating the visible-wavelength beam’s intensity, the laser microdoses shown in (v) are delivered. Drawing adapted with permission [Harmening and Sincich (54)]. (D) Examples of target percepts with corresponding cone activations and laser microdoses, ranging from colored squares to complex imagery. Teal-striped regions represent the color “olo” of stimulating only M cones. 
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Light and Matter : The 2018 theory of Physically-Based Rendering and Shading by AllegorithmicRead more: Light and Matter : The 2018 theory of Physically-Based Rendering and Shading by Allegorithmicacademy.substance3d.com/courses/the-pbr-guide-part-1 academy.substance3d.com/courses/the-pbr-guide-part-2 Local copy:
 
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Victor Perez – The Color Management Handbook for Visual Effects ArtistsRead more: Victor Perez – The Color Management Handbook for Visual Effects ArtistsDigital Color Principles, Color Management Fundamentals & ACES Workflows 
LIGHTING
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Composition and The Expressive Nature Of LightRead more: Composition and The Expressive Nature Of Lighthttp://www.huffingtonpost.com/bill-danskin/post_12457_b_10777222.html George Sand once said “ The artist vocation is to send light into the human heart.” 
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Gamma correctionRead more: Gamma correction http://www.normankoren.com/makingfineprints1A.html#Gammabox https://en.wikipedia.org/wiki/Gamma_correction http://www.photoscientia.co.uk/Gamma.htm https://www.w3.org/Graphics/Color/sRGB.html http://www.eizoglobal.com/library/basics/lcd_display_gamma/index.html https://forum.reallusion.com/PrintTopic308094.aspx Basically, gamma is the relationship between the brightness of a pixel as it appears on the screen, and the numerical value of that pixel. Generally Gamma is just about defining relationships. Three main types: 
 – Image Gamma encoded in images
 – Display Gammas encoded in hardware and/or viewing time
 – System or Viewing Gamma which is the net effect of all gammas when you look back at a final image. In theory this should flatten back to 1.0 gamma.
 (more…)
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Fast, optimized ‘for’ pixel loops with OpenCV and Python to create tone mapped HDR imagesRead more: Fast, optimized ‘for’ pixel loops with OpenCV and Python to create tone mapped HDR imageshttps://pyimagesearch.com/2017/08/28/fast-optimized-for-pixel-loops-with-opencv-and-python/ https://learnopencv.com/exposure-fusion-using-opencv-cpp-python/ Exposure Fusion is a method for combining images taken with different exposure settings into one image that looks like a tone mapped High Dynamic Range (HDR) image. 
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Free HDRI librariesRead more: Free HDRI librariesnoahwitchell.com 
 http://www.noahwitchell.com/freebieslocationtextures.com 
 https://locationtextures.com/panoramas/maxroz.com 
 https://www.maxroz.com/hdri/listHDRI Haven 
 https://hdrihaven.com/Poly Haven 
 https://polyhaven.com/hdrisDomeble 
 https://www.domeble.com/IHDRI 
 https://www.ihdri.com/HDRMaps 
 https://hdrmaps.com/NoEmotionHdrs.net 
 http://noemotionhdrs.net/hdrday.htmlOpenFootage.net 
 https://www.openfootage.net/hdri-panorama/HDRI-hub 
 https://www.hdri-hub.com/hdrishop/hdri.zwischendrin 
 https://www.zwischendrin.com/en/browse/hdriLonger list here: https://cgtricks.com/list-sites-free-hdri/ 
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