作者：Roby bulnes 11 年以前
292
studyguide4
Various types of distortions in photography can affect the appearance of images. Pincushion distortion makes straight lines appear to bend inward, while barrel distortion causes them to bow outward.
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studyguide4 Levels adjustment corrects the tonal range and color balance of an image by adjusting intensity levels of image shadows, midtones, and highlights. Pincushion distortion causes straight lines to appear to bend inward. vignetting causes the edges, especially the corners, of an image to be darker than the center. histogram illustrates how pixels in an image are distributed by graphing the number of pixels at each color intensity level. Keystone distortion occurs when an object is photographed from an angle rather than from a straight-on view. The Curves adjustment lets you adjust points throughout the tonal range of an image (from shadows to highlights). Chromatic aberration is caused by the failure of the lens to focus different colors to the same spot. barrel distortion causes straight lines to appear to bow outward. camera lenses can exhibit different types of defects at certain focal lengths, f-stops, and focus distances. image rotation commands let you rotate or flip an entire image. cropping is the process of removing portions of an image to create focus or strengthen the composition.
