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13. Input Source File Service
Image 13-1
Video pixels
A Video Signal
B Image
C Total Pixels
DStartPixels
EActivePixels
Image 13-2
Video clamping
A Clamp signal
B Leading edge sync signal
C Trailing edge sync signal
D Clamp pulse delay
E Clamp pulse width
3:2 pull-down
Method use
d to map the 24 fps of film onto the 30 fps (60 fields) or 25 fps (50 fields), so that one film frame occupies
three video fields, the next two, etc. It means the two fields of every other video frame come from different film frames
making operations such as rotoscoping impossible, and requiring care in editing. Some sophisticated equipment can
unrav
el the 3:2 sequence to allow frame-by-frame treatment and subsequently re-compose 3:2. The 3:2 sequence
repeats every five video frames and four film frames, the latter identified as A-D. Only film frame A is fully on a video
frame and so exists at one time code only, making it the editable point of the video sequence.
2:2 pull-down
The pr
ocess of transferring 24-frames/sec film format into video by repeating each frame as two video fields. ( AD )
Artefacts
Undesirable elements or defects in a video picture. These may occur naturally in the video process and must be
eliminated in order to achieve a high-quality picture. Most common in analog are cross color and cross luminance.
Mos
t common in digital are macroblocks, which resemble pixelation of the video image.
13.4 Editing a File
How to enter the Edit File menu:
1. From the adjustment mode menu, select item RANDOM ACCESS. (menu 13-9)
The Random Access adjustment menu appears on-screen and in the graphical display. (menu 13-10)
2. Fr
om the Random Access adjustment mode menu, select item FILE SERVICE.
The File Service menu appears on-screen and in the graphical display. (menu 13-11)
3. From the File Service menu, select item EDIT.
The Edit File menu appears on-screen and in the graphical display. The Edit File menu contains a list of all stored files with on
top of the list the active file (mostly to be edited). (menu 13-12)
4. Sel
ect the file which has to be edited.
5. Press ENTER (RCU) or the selection wheel to confirm.
The Edit File menu for that specific file appears on-screen and in the graphical display showing all the file parameters which can
be changed. The file parameters are spread out over two menus, linked via item OPTION.
Parameters which are not adjustable are displayed light grey in the menu. (menu 13-13)
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