Capture, image capture, frame grabbing – Epiphan VGA2USB Pro User Manual
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11. About Epiphan frame grabbing technology
Glossary of Terms
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Epiphan Frame Grabber
• 8 bits per pixel, grayscale 256 levels: uses a similar amount of
data as RGB 8 bpp but images are black, white, and shades of
gray. Usually you would only use 8 bpp grayscale if your
video source or codec used this color depth or to reduce file
size.
• 5 bits per pixel, grayscale 32 levels: a grayscale format that has
fewer levels of gray and uses less data than grayscale 256
levels. Usually you would only use 5 bpp grayscale if your
video source or codec used this color depth or to reduce file
size.
• Black and white: a very low quality and low data format that
uses only black and white. Usually you would only use black
and white if your video source is producing a black and white
video signal.
• 16 bits per pixel, YUY2(422), UYVY: a color format used by
many video sources. Similar to RGB 16 bpp but uses
compression and other techniques to improve the video
signal. Epiphan Frame Grabbers and the video capture
application convert YUY2(422), UYVY video images to RGB,
grayscale or black and white images.
All color depths are not supported by all video codecs or image
file formats. Most video codecs and image file formats support
RGB 24 bpp. It may be difficult to find a video codec that supports
other color depths. Some image file formats do not support all
color depths. Epiphan Frame Grabber web broadcasting operates
at RGB 24 bpp.
Epiphan Frame Grabbers capture images at the color resolution of
the video source up to the maximum resolution supported by the
Frame Grabber. The maximum resolution supported by the
VGA2USB Frame Grabber is 16 bits per pixel (bpp). The
maximum supported by all other Epiphan Frame Grabbers is 24
bpp.
Capture, image capture, frame grabbing
Epiphan products can capture VGA, DVI, or dual DVI images.
Capturing VGA data involves using a Frame Grabber to digitize
analog VGA signals and transmit the digitized images as frames
over a USB connection to the Epiphan video capture application.