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Later processes moved toward a black-and-white image, although photographers have used toning solutions to convert silver in the image to silver sulphide, imparting a brown or sepia tone. Similarly, selenium toner produces a blue-black or purple image by converting silver into more stable silver selenide. [2]
Grayscale images are distinct from one-bit bi-tonal black-and-white images, which, in the context of computer imaging, are images with only two colors: black and white (also called bilevel or binary images). Grayscale images have many shades of gray in between.
The names black-and-white, B&W, monochrome or monochromatic are often used, but can also designate other image types with only one sample per pixel, such as grayscale images. In Photoshop parlance, a binary image is the same as an image in "Bitmap" color mode. [3] [4]
Sepia toning is a specialized treatment to give a black-and-white photographic print a warmer tone and to enhance its archival qualities. The metallic silver in the print is converted to a sulfide compound, which is much more resistant to the effects of environmental pollutants such as atmospheric sulfur compounds.
A hand-colored print of George Méliès' The Impossible Voyage (1904). The first film colorization methods were hand-done by individuals. For example, at least 4% of George Méliès' output, including some prints of A Trip to the Moon from 1902 and other major films such as The Kingdom of the Fairies, The Impossible Voyage, and The Barber of Seville were individually hand-colored by Elisabeth ...
where , , and are the color-balanced LMS cone tristimulus values; ′, ′, and ′ are the tristimulus values of an object believed to be white in the un-color-balanced image, and ′, ′, and ′ are the tristimulus values of a pixel in the un-color-balanced image. Matrices to convert to LMS space were not specified by von Kries, but can be ...
The simplest thresholding methods replace each pixel in an image with a black pixel if the image intensity , is less than a fixed value called the threshold , or a white pixel if the pixel intensity is greater than that threshold. In the example image on the right, this results in the dark tree becoming completely black, and the bright snow ...
In video systems, white balance can be achieved by digital or electronic manipulation of the signal and hence color-correction filters are not entirely necessary. However, some digital cinema cameras can record an image without any digital filtering applied; using physical color-correction filters to white balance (instead of digital or ...
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