WinDAS WPB Procedure

August 20, 2025, 5:00 pm

Outline

Sony monitors compatible with DAS use a bespoke method for digitally controlling RGB gain and bias:
- When the contrast is adjusted, gains can fluctuate. Respectively, when brightness is adjusted, biases can fluctuate.
- In an effort to counter this effect, these Sony monitors are calibrated with two separate “high” and “low” steps for gain, and the same is done for bias.
- With these high and low values defining a set range, the monitor uses a formula to calculate ideal white balance depending on the contrast and brightness controls set by the user.
In practice, this system has been shown to poorly adapt to the aging of the CRT and passive electronics.
Even models with the “expert” color controls are often too far drifted to correct with the provided ranges, so a full pass of the WPB procedure is necessary.

The formula used to calculate RGB gains and biases is specifically dependent on the color coordinates defined by the DAS program.
If the WPB procedure is performed inaccurately or deviating from these coordinates, the resulting RGB values will be skewed, and will change with adjustments to brightness and contrast.
- Specifically, the bias steps are performed at a low luminance target, which is very difficult to confirm visually.

On DAS compatible monitors, the G2 / Screen voltage setup step is done as part of the WPB procedure.
- The optimal method is to visually confirm (by eye) that a 1:1:1 RGB value is discernible from the pedestal / black level.
When calibrating each of the preset color temperatures, there are several steps that require measuring with the meter while adjusting values with DAS in real time to reach a specified target.

Allow the monitor to have warmed up for 1 hour
Open the procedure menu: Adjustment > Procedure then select the White Balance Adjustment procedure
DAS will request a certain resolution, and that you adjust size and center for that resolution. This is unnecessary for adjusting white balance. Click OK to continue past this step
Click OK on the next step asking for the monitor to be warmed up
Click BYPASS on the White Balance Test
Next, the program will provide some adjustment tips that are more applicable to the originally intended color analyzer hardware. Click OK on these steps
Finally, a warning is issued about exiting the WPB procedure. Click OK to proceed

For the G2 step, open blacktest.png and adjust G2 until it’s as low as possible but the first square labeled 1 is still discernible from the black background
- Some monitors have a similar step following the G2 voltage, simply perform the same method used before
Open HCFR in DVD manual mode
- set the references:
Adjust Cutoff Maximum
- click any IRE value besides 0 and start a continuous measure
- Match the target luminance and prioritize lower dE
Close the current measure, and reopen HCFR in automatic mode
Adjust Drive (first round)
- Click on 100IRE and start a continuous measure
- Match the target luminance and prioritize lower dE
Adjust Cutoff Minimum
- Click on 30IRE and start a continuous measure.
- Prioritize lowest dE
Adjust Drive (second round)
- Click on 100IRE and start a continuous measure
- Match the target luminance and prioritize lower dE
Check Luminance
- Click OK to continue
Adjust Contrast Minimum
- Continue measuring on 100IRE
- Match the target luminance and prioritize lower dE
Wait for the luminance to stabilize
- Continue measuring on 100IRE
- Wait around 15 to 30 seconds for the luminance to stay consistent
- Click OK
There will be several prompts to confirm tracking
- Click OK to continue through to the next color temperature

Open HCFR in DVD manual mode
- set the references:
Adjust Cutoff Maximum
- click any IRE value besides 0 and start a continuous measure
- Match the target luminance and prioritize lower dE
Close the current measure, and reopen HCFR in automatic mode
Adjust Drive (first round)
- Click on 100IRE and start a continuous measure
- Match the target luminance and prioritize lower dE
Adjust Cutoff Minimum
- Click on 30IRE and start a continuous measure.
- Prioritize lowest dE
Adjust Drive (second round)
- Click on 100IRE and start a continuous measure
- Match the target luminance and prioritize lower dE
Check Luminance
- Click OK to continue
Adjust Contrast Minimum
- Continue measuring on 100IRE
- Match the target luminance and prioritize lower dE
Wait for the luminance to stabilize
- Continue measuring on 100IRE
- Wait around 15 to 30 seconds for the luminance to stay consistent
- Click OK
There will be several prompts to confirm tracking
- Click OK to continue through to the next color temperature

Open HCFR in DVD manual mode
- set the references:
Adjust Cutoff Maximum
- click any IRE value besides 0 and start a continuous measure
- Match the target luminance and prioritize lower dE
Close the current measure, and reopen HCFR in automatic mode
Adjust Drive (first round)
- Click on 100IRE and start a continuous measure
- Match the target luminance and prioritize lower dE
Adjust Cutoff Minimum
- Click on 30IRE and start a continuous measure.
- Prioritize lowest dE
Adjust Drive (second round)
- Click on 100IRE and start a continuous measure
- Match the target luminance and prioritize lower dE
Check Luminance
- Click OK to continue
Adjust Contrast Minimum
- Continue measuring on 100IRE
- Match the target luminance and prioritize lower dE
Wait for the luminance to stabilize
- Continue measuring on 100IRE
- Wait around 15 to 30 seconds for the luminance to stay consistent
- Click OK
There will be several prompts to confirm tracking
- Click OK to continue through to the next color temperature