Manualshelf

5.5

ManualsBrandsApple ManualsOtherMOTION
1329133013311332133313341335133613371338
Table Of Contents
1334Motion User Guide
Glossary
alpha channel Ordinary video clips and image files have three channels of color
information: red, green, and blue. Many video and image file formats also support an
additional alpha channel, which contains information defining areas of transparency. An
alpha channel is a grayscale channel where white represents areas of 100 percent opacity
(solid), gray regions represent translucent areas, and black represents 0 percent opacity
(transparent).
When you import a QuickTime movie or an image file into a project, its alpha channel is
immediately recognized by Motion. The alpha channel is then used to composite that
object against other objects in the canvas.
aspect ratio A film or video frame’s width-to-height ratio on any viewing screen. High-
definition (HD) video has an aspect ratio of 16:9.
canvas The visual workspace in Motion. Here you can arrange objects in your project,
adjust object parameters using onscreen controls, and play back your project. What you
see in the canvas is what is exported when you share your project.
canvas toolbar A row of tools in the center of the Motion window (under the canvas and
above the timing toolbar), for manipulating objects in the canvas. Tools on the left side of
the canvas toolbar let you transform objects in the canvas in 2D or 3D space, as well as
zoom or pan the view in the canvas. Tools in the center of the canvas toolbar let you create
shapes, paint strokes, text, and masks.
chroma The color information contained in an image, consisting of hue, which represents
the color itself, and saturation, which represents the intensity of the color.
clipping In digital video, the state of an image with a color gamut that falls outside of
the minimum and maximum level that can be represented in a color space. For example,
when a Rec. 2020 source image is converted to Rec. 709, the image may appear “clipped”
(colors muted or over- or underexposed when compared with the original) because the
smaller target color space (Rec. 709) cannot reproduce the detail in the image’s original
color space (Rec. 2020). Clipping can occur in any color channel of an image.
In digital audio, clipping describes a signal that exceeds the maximum sample value of 0
dBFS during playback or recording, resulting in audio distortion.
codec Short for compressor/decompressor, or encode/decode. A software component
used to translate video or audio from its current form to a different, digitally compressed
form. Apple ProRes and H.264 are common QuickTime video codecs.