DVDO AVLab TPG Betriebsanweisung PDF herunterladen (Seite 36)

DVDO AVLab TPG - 4K Test Pattern Generator

DVDO AVLab TPG 36 A.04

clip at the top end and 100% contrast is rarely the right choice, so if it does not clip

start with something around 80% to begin adjustments

iii. Double check the visual adjustments with a meter read dynamic range series

iv. Note that the brightness control actually controls the detail in darker parts of the image.

If missing information in the blacks, brightness is too low. If missing information in the

white part of the image, the contrast is too high. Higher contrast washes out the detail

in bright images.

g. Gamma – the nonlinear luminance adjustment: Run the series and check each of the TVs

gamma settings to find the one closest to the 2.35 target. Some devices have a 10 point

gamma adjustment that allows precise adjustment of gamma if it is non linear.

h. Set overall color: Using an 8x3 color bar and either a blue only mode on the TV/Projector, or if

not available a blue gel/glasses to block out all other colors. Adjust the color and tint setting

until the blue and white bars next to each other appear to be the same.

i. Resolution and Bit accuracy: Use sharpness pattern (Freq Sweep) to adjust sharpness until the

finest detail is visible (fine vertical lines) but no white bleed is visible around the center box.

Use the Frame/Geometry pattern to verify that overscan and other scaling on the TV and any

inline AVR/processor is off. With the frequency sweep pattern, verify that no keystone is used

– keystone will distort the fine vertical lines.

j. Grayscale Two point adjust: First pass, use 30 and 80% IRE to roughly set overall white

balance –normally using only the gain and offset controls for each color. You should attempt

to find a setting with the lowest delta-E across the IRE range, preferably under 3 with as little

green error as possible. As green is the most visible, the green error should always be the

primary target. Adjust red and blue first and attempt to pull green into proper alignment

without actually adjusting green. Also, use the smallest window pattern size possible for TVs

that dynamically adjust light output.

k. Grayscale multipoint and gamma: If available use 10 point gamma and white balance controls

to perform final adjustments across the entire luminance range. Again, leave green with zero

error.

l. Color Management System:

i. Goal is to get every parameter correct for every color. CMS controls, not present on

every display (and if not a DVDO Duo adds that capability to any display) normally

provide saturation, hue, and luminance for each specific color to properly position that

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DVDO AVLab TPG Betriebsanweisung Seite 36