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Image Save, Print and Copy to Clipboard
The process to save, print or copy an image starts with the digitizing of a single
video frame. When one of these functions are clicked on, the next video frame is
moved into your PC’s main system memory instead of the VGA display. Your
PC’s processor then converts the digitized video image into a 24-bit DIB image (a
format which is used internally in Windows), and then copied back into the VGA
memory so that you can see the image which will be printed or saved. This
becomes a “frozen” image in the window.
The video images which are digitized can be saved to disk, printed to a color or
black/white printer or copied to the clipboard. These functions can be viewed from
the File menu:
There are a few things which need to be noted. First, because a video frame is
composed of two “fields”, an odd field with the odd lines in the image and an even
field composed of the even lines, there might be a distortion in the frozen image if
there was rapid motion while the image was being moved into main system memo-
ry. This distortion is called “interlaced artifact”.
Another item to note is that the video image, when converted into a 24-bit DIB
image, will look lighter than it did when it was in motion. You can adjust the
image’s brightness, contrast and color saturation and hue by clicking on
Configure/Color. These adjustments are made during the digitizing process on
the board and will affect both the “live” image and the frozen image.
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WinTV-USB Installation and Reference Manual