DVDO AVLab TPG Guía de usuario descargar pdf (Pagina 34)

DVDO AVLab TPG - 4K Test Pattern Generator

DVDO AVLab TPG 34 A.04

d. Be sure to wear appropriate attire – no white – even stripes, no laptop pointing at screen

e. Regarding projectors, most of the time the lamp is not a pure white but tends to put out more

blue and green than red or vice versa. In this case, to calibrate requires cutting colors as

opposed to boosting them so overall light comes down. So it depends on the usage model

whether this is better for the customer or not. A projector in a school showing only powerpoint

might be better served uncalibrated so you get more light output for the money.

f. About meters. Basic calibration can be done with just about any meter, but some are better in

accuracy than others. Some midrange meters have pre-programmed memories that let you

choose the sink type (LCD, LED, projector front with HPD lamp etc) – these settings can make

a middle level meter work much better by ignoring some colors that are not in the color space

of the device being measured. Spectral devices (like I1pro2 and Minolta) are slower and the

ipro is good at lighter areas but poor on dark areas. To get the speed of a tri-stimulus device,

you can take a profile reading using the ipro and then apply that offset to a tri-stimulus like

the Klein or X-Rite C6 meter. C6 uses gel filters and can go out of calibration after a period of

time so recalibrate the meter periodically. However, it can only be calibrated as long as the

filters are still within a reasonable range. The Ipro has no filter and is accurate long term.

2) Calibration Setup

a. We recommend the ISF calibration workflow

b. Adjust frame and geometry and make sure that overscan settings are not on by default; make

sure that the single pixel line around the edge is visible.

c. Insure that the proper video setting is being used on the TV – it should be set to Video or YUV.

Unless you have a source that only puts out RGB, its best to have the entire system send the

display YUV and let the TV convert to RGB for display.

d. Properly set up the test pattern generator – it needs to match the source. For instance, the

TPG should not be allowed, in normal calibration, to automatically match the TV capability.

Check the main source – blueray to other - and set TPG to that bit depth and calibrate to that.

e. Choose the correct meter/combination for the job. A high end calibration begins with

calibrating a spectral meter (ipro, Minolta or other) to a tri-stimulus device (Klein, C6) to get

the most accuracy and also the speed of the tri-stimulus.

f. Calman setup – under settings grayscale points – if using a tri-stimulus start with 10 point 10-

100, if i1pro start at 20% as it does not measure dark quickly. Gamma setup of 2.35 is

optimal target

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DVDO AVLab TPG Guía de usuario Pagina 34