Gray card - Wikipedia 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 - Wikipedia 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]
Why Does the 18 Grey Rule Explain Bad Exposures (October 2026) Complete . . . What Is the 18% Grey Rule? The 18% grey rule is the foundational calibration standard for all reflected light metering in photography It states that a surface reflecting 18% of the light that strikes it represents middle gray, the perceptual midpoint between pure black and pure white
18% Gray Cards - Whats the Idea for photography? It was believed that 18% reflectance was the gray tone level that the human eye recognizes as "middle gray", meaning our brain thinks this tone looks like it should be about middle of the range between black and white
Why is 18% grey considered to be in the middle for photography? My understanding is that 18% grey is considered the average reflectance of light from the world around us - not snow (about 90%) or a black cat in a coal mine at the other end, but an average on an average day
18% Gray - The Middle Value - GreatPhotography 18% gray cards have been used for decades as a tool onto which photographers could aim a spot meter and use the brightness as the exposure of the scene Interestingly enough, 18% gray cards will reflect the equal amount of light that they receive
ColorChecker® 18% Gray Balance - X-Rite Using the ColorChecker 18% Gray Balance target for reflective spot exposure metering will give you the confidence that your images and video footage are exposed as accurately as possible with the same 18% gray reference square found in the 24-patch ColorChecker Classic target
18% Gray Reflectance Target - Imatest This is a standard 18% gray target for ISO16505 testing Size is 914 4mm x 610mm (36” x 24”) with optional mounting on 6mm ePanel
Neutral Test Card GRAY SIDE -18% Reflectance WHITE SIDE-90% Reflectance KODAK NEUTRAL TEST CARD Gray Side 18% Reflectance eir reproduction It is especially useful where precision is required, as in olor photography Manufacture of the Test Card is controlled within close limits to produce neutral surfaces of standardized r flectance values To prevent specular or mirrorlike reflections, both sides ha