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Visual snow: dynamic, continuous, tiny dots observed across the entire visual field at any time of the day, regardless of lighting conditions, persisting for more than three months. The dots are usually black/gray on a white background and gray/white on a black background; however, they can also be transparent, white flashing, or colored.
In a technique known as blue field entoptoscopy, the effect is used to estimate the blood flow in the retinal capillaries.The patient is alternatingly shown blue light and a computer generated picture of moving dots; by adjusting the speed and density of these dots, the patient tries to match the computer generated picture to the perceived entoptic dots.
This random dot autostereogram features a raised shark with fine gradient on a flat background. ( ) The revelation of the shark. The fine-tuned gradient requires a pattern image more complex than standard repeating-pattern wallpaper, so typically a pattern consisting of repeated random dots is used.
Left: Halftone dots. Right: Example of how the human eye would see the dots from a sufficient distance. Halftone is the reprographic technique that simulates continuous-tone imagery through the use of dots, varying either in size or in spacing, thus generating a gradient-like effect. [1] "Halftone" can also be used to refer specifically to the ...
The anisotropy, or directional dependency, of the cosmic microwave background is divided into two types: primary anisotropy, due to effects that occur at the surface of last scattering and before; and secondary anisotropy, due to effects such as interactions of the background radiation with intervening hot gas or gravitational potentials, which ...
Pale Blue Dot is a photograph of Earth taken on February 14, 1990, by the Voyager 1 space probe from an unprecedented distance of approximately 6 billion kilometers (3.7 billion miles, 40.5 AU), as part of that day's Family Portrait series of images of the Solar System.
Screentone: Transparent adhesive sheets manufactured with a distinctive pattern (typically, some form of dots or hatching, but also including a variety of flashy effects like stars or explosions, or commonplace scenes such as cityscapes, schoolyards, and natural landscapes), these are cut out and overlapped on the panel to introduce shading and ...
Ben Day dots are of equal size and distribution across a specific area, and are commonly applied to line art or graphic designs. To apply the dots, the artist would cut the appropriate shapes from transparent overlay sheets, which were available in a wide variety of dot size and distribution, to provide a range of tones to use.