Matrox Rainbow Runner Guide de l'utilisateur télécharger pdf (Page 28)

28 Matrox Rainbow Runner G-Series – User Guide

Video format settings

RGB – Click an RGB button to select an uncompressed video file

format. Use an RGB format to video conference with VDOPhone and

to capture still images with Photo Express. The bit values represent

how many bits of information are used for color palette information;

the larger the bit value, the more colors can be used, but the larger the

file size.

8-bit – 256 shades of gray

16-bit – 65,536 colors

24-bit – 16,777,216 colors

MJPEG – For more information, see “Capture options”, page 24.

Set Video Size – Click this button to adjust the video

image size (resolution) settings for the currently selected

format (RGB or MJPEG). For MJPEG, you can also

select its quality setting.

Also, with MJPEG you can compare the speed of your

hard disks (

HD Benchmark results box) with the speed

required by the selected settings (

Data rate box). (The

data rate estimate doesn’t take audio into account.) If the

hard disk you’re using is too slow, video files you capture

may appear jerky.

Overlay and preview modes

The video capture program you’re using may give you a choice of overlay or preview modes.

If the

MJPEG video format is selected, overlay and preview settings have no effect. If an RGB

video format is selected, overlay and preview settings affect how video is viewed or captured:

 With overlay mode, everything on the video window is captured. For example, any part of

a dialog box overlapping the video window appears in the captured video.

 With preview mode, you will get a lower frame rate (resulting in jerky video) and you may

not be able to view or capture video if there isn’t enough graphics memory available. The

amount of graphics memory available depends on how much memory is on your graphics

card, the size of the video window, and the resolution and color palette settings of your

display.

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Matrox Rainbow Runner Guide de l'utilisateur Page 28

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