Abt VP30 - Manual (Page 39)

35
When this test pattern is displayed incorrectly, the resulting image does not look like a fine checker-
board and may have irregular patterns. When this is the case, the chosen output resolution may not
be the native resolution of your display or your display may scale all input signals even if the input
resolution is already at native resolution. Check to make sure that the output resolution selected
on the iscan is the correct output resolution for your display.
NOTE: If this test pattern does not appear as it should, and you have chosen the native resolution of
your display, you may not be able to bypass the internal processing on your display.
The ‘Vertical Lines’ test pattern should appear as one pixel wide black and white columns. If you see
any irregular pattern(s) in the image, you know that the display is scaling the signal horizontally.
To override the internal scaling, adjust the horizontal size of the image to see if the test pattern can
be displayed correctly.
output setup
_
format
_
user
_
H-Size
_
Adjust
The ‘Horizontal Lines’ test pattern should appear as one pixel tall black and white rows. If you see
any irregular pattern(s) in the image then you know that the display is scaling the signal vertically.
To override the internal scaling, adjust the vertical size of the image to see if the test pattern can
be displayed correctly.
output setup
_
format
_
user
_
V-Size
_
Adjust
The ‘Judder’ test pattern displays a bar that bounces back and forth at the chosen output frequency
selected in the ‘framerate’ parameter. When this test pattern is displayed correctly, the bar moves
smoothly across the screen and bounces from side to side. When this pattern is displayed incorrectly,
this bar may ‘tear’ as it moves across the screen. To adjust the framerate conversion, go to the
‘Output Setup’ menu.
For displays that will only display 50Hz (PAL)
output setup
_
framerate
_
50Hz
_
50Hz Lock
output setup
_
framerate
_
60Hz
_
unlock
_
49.95
For displays that will only display 60Hz (NTSC)
output setup
_
framerate
_
50Hz
_
unlock
_
59.94
output setup
_
framerate
_
60Hz
_
60Hz Lock
Display Calibration
Test Patterns Used: Brightness/Contrast
Color8 bars75
Color8 bars00
Gray ramp
The iScan VP30 has several test patterns to assist in the setup of your display. Adjustments should be
made on your display, not on the iScan, to correctly setup your iScan and display.
The ‘Brightness/Contrast’ test pattern will assist you in setting up both the brightness (black level)
and contrast (white level) of your display. The ‘Brightness/Contrast’ test pattern is composed of
4 quarter-screen blocks. Two of the blocks have a background level of standard black and the other
two blocks have a background level of standard white. embedded in the black blocks are 3 bars.