Metering and Middle Gray
Your autoexposure system can't think. It is designed to do only one thing.
Middle gray. A standard average gray tone of 18 percent reflectance. See Gray card.
Midtone. An area of medium brightness, neither a very dark shadow nor a very bright highlight.
Middle Gray see Gray Card and 18% Assumption*
Mid-light Crisis *
The stage between Lighter's Block* and Terminal Trauma* when you would turn everything off and start all over again if the producer were not staring at his watch and muttering.
middle gray = 137R-137G-134B
2 points yellow
BreezeBrowser Pro default white balance
BreezeBrowser Pro color picker white balanced ...
Middle gray: clear north sky; dark skin, average weathered wood
VI
Average Caucasian skin; light stone; shadows on snow in sunlit landscapes ...
Tip: The middle gray used for the Overlay layer isn't exactly middle gray. To select a neutral gray for the layer, double-click on your foreground color swatch and in the Lab portion of the Color picker, enter 54,0,0.
Image 14 ...
Light meters are calibrated to see one shade only-middle gray. This means the information that the meter provides, no matter how much light is falling on the subject or what the reflection characteristics are, ...
They render every scene as 18% middle gray and adapt the exposure accordingly. This will be OK for the majority of scenes, it is only when very dark or bright parts dominate a scene that the meter will be fooled by trying to render it as middle gray.
Each step of the scale is equivalent to 1/3 EV (a third of a stop), we select one step as 'middle gray' and measure outwards to define the dynamic range.
Middle tone/Midtone is the middle gray in the pure white to pure black tone scale. Midtone also refers to the range of colors that aren't mixed with black (the shadows) or white (the highlights).
Moiré ...
A palette in Photoshop that allows making changes in tonal values using controls that adjust the white, middle gray, and black points of an image.
mid-tone dot
a point in the middle gray area of a halftone that equals or comes close to the average of the nearly background area.
I discovered that my hand is 1.5 stops brighter than middle gray. Very "handy" for incident metering (and very white too).
As you move it towards the left, more of the tones in your image will fall to the right of middle gray, and the image will get brighter. As you move it to the right, the reverse happens.
If you're using Photoshop Elements, you don't have curves, though; you'd use the middle gray slider in Levels. If you're using Camera Raw, you can use Brightness. These tools don't provide as much control, however.
You can easily target a subject tone, taking readings of a key highlight, key shadow value, or midtone value. That way you can “place' a certain tonal value at middle gray and make very expressive, ...
Contrast: the difference and distribution of light and dark tones in an image. An image having mostly black and white tones is said to be contrasty whereas an image composed mostly of middle gray tones would be considered to be flat.
same pure colors when they're simply desaturated using the Hue/Saturation dialog in Photoshop. Because Hue/Saturation works in the HSL color model rather than in Lab color, the very saturated colors in our gradient are all rendered as middle gray.
The target was illuminated from behind by a very uniform light source. The area between the target and the camera was surrounded by black material to remove any reflections or extraneous light sources. The exposure was set for the middle gray tones.
 See also: Gray, Light, Image, Camera, Exposure
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