448 Glossary
relative colorimetric A rendering intent suitable for photographic images. It compares
the highlight values of the source color space to that of the destination color space and
shifts out-of-gamut colors to the closest reproducible color in the destination color
space. See also rendering intent.
rendering intent The method by which colors that are out of gamut for a selected
output device are mapped to that device’s reproducible gamut.
resolution The amount of information a digital image is capable of conveying.
Resolution is determined by the combination of file size (number of pixels), bit depth
(pixel depth), and dpi (dots per inch). See also bit depth, dots per inch (dpi), pixel.
retouching The process of altering an image to add or remove details. See also
burning, compositing, dodging, effects, filters.
RGB Short for Red, Green, Blue. A color space commonly used on computers in which
each color is described by the strength of its red, green, and blue components. This
color space directly translates to the red, green, and blue elements used in computer
displays. The RGB color space has a very large gamut, meaning it can reproduce a wide
range of colors. This range is typically larger than printers can reproduce. See also
additive color.
rods A type of receptor in the eye capable of perceiving luminance. Rods do not
perceive color, but only levels of brightness. See also cones.
saturation The intensity of color in an image. Saturated colors are perceived to have a
“purer” look, resulting from the absence of the color gray. See also adjustment, desaturate.
Select In Aperture, the highest rating that can be applied to an image as part of the
photo editing process. A Select rating is applied when you intend to display or
distribute the image. See also photo edit, rating, Reject.
selective focus The process of isolating a subject by using an f-stop that produces a
shallow depth of field. See also depth of field.
shadows The darkest areas of a subject or scene. See also contrast, density, highlights.
shortcut menu A menu you access by holding down the Control key and clicking an
area of the interface, or by pressing the right mouse button.
shutter A complicated mechanism, usually consisting of a blade or a curtain, that
precisely controls the duration of time light passing through the lens remains in
contact with the digital image sensor. See also shutter speed.
shutter priority A setting on certain cameras that automatically sets the aperture for a
correct exposure based on the shutter speed set by the photographer. See also
aperture priority, exposure.
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