
Glossary
O
opacity
Determines how visible an effect is when applied to an image or a selection. High opacity produces a more solid effect, while low
opacity results in a nearly invisible effect.
overexposed
Images that are overexposed have too many highlights, and tend to look faded. You typically overexpose images by exposing
your digital camera's sensor to light for too long.
P-Q
panning
Moving zoomed images vertically, horizontally, and diagonally across the display area to view specific areas of the image.
PDF
An acronym for Portable Document Format. You can view PDFs on any computer using the free Adobe Reader software.
Perceptual
Rendering intent that scales all of the colors within one gamut to fit within another gamut. Best used for photographic images, as
it maintains the relationship between the colors more accurately than the colors themselves.
photo album
See album.
photo editor
See image editor.
pincushion distortion
In pincushion distortion the photo appears to shrink inwards toward the center.
pixel (PICture ELement)
Smallest visible portion of a digital image, arranged in rows and columns.
plug-in
Software module that adds functionality to a larger program.
PPI (pixels per inch)
Measurement of how an image is displayed. More pixels per inch result in higher image quality.
presets
A preset contains image correction settings. You can create and use presets to ensure that settings you apply are the same and
consistent across all images.
primary colors
Colors that can produce other colors when blended. For example, in the RGB color model, red, green, and blue are primary
colors.
R
raster image
Image composed of a rectangular grid of pixels. Each pixel contains a defined value about its color, size, and location in the
image. As a result, resizing the image can affect its quality.
rating
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