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A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.
Middle gray. 50% CIELAB lightness. ( Y = 18.4%) In photography, painting, and other visual arts, middle gray or middle grey is a tone that is perceptually about halfway between black and white on a lightness scale; [1] in photography and printing, it is typically defined as 18% reflectance in visible light. [2] [3]
Show comments. Coco Gauff, Novak Djokovic and other players at the U.S. Open will be playing for a record total of $75 million in compensation at the year's last Grand Slam tennis tournament, a ...
Rotten Tomatoes logo. On the film review aggregation website Rotten Tomatoes, films that every surveyed critic[1]considered bad have a 0% rating. [2][3][4]As of 2023, only 40 films with more than 20 reviews have received this rating. The Ringer, analyzing films' Rotten Tomatoes scores compared to change in profit margin, estimated that a film ...
J Balvin is ready to unleash his first album in nearly three years. On Thursday, the Colombian singer and rapper announced his new album, “Rayo,” the follow-up to 2021’s “Jose,” will ...
Energy demand is set to explode over the next decade, with artificial intelligence leading the way. According to Goldman Sachs , data center power demand is expected to grow 15% annually through 2030.
Nico360 was launched in 2016 and claimed as the world's smallest 360-degree camera with size 46 x 46 x 28 mm (1.8 x 1.8 x 1.1 in) and price less than $200. With virtual reality mode built-in stitching, Wifi, and Bluetooth, live streaming can be done.
The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn ), or 1 km in 2.91 s or one mile in 4.69 s.