Luciano Merighi ha detto:
per i tre colori primari, se ti riferisci all'intensità oppure alla saturazione, il discorso può cambiare....
Purtroppo non lo so ti descrivo il problema:
il mio proiettore Infocus IN78 ha la possibilità, tramite un programma proprietario, di modificare le coordinate del gamut per poter poi ottimizzare l'intero processo di calibrazione.
In pratica dalle misure colorimetriche dei tre primari Rosso, Verde, Blu e del bianco si ottengono i valori xyY alle condizioni ambientali di proiezione e non di laboratorio che possono essere usate per sostituire quelle di default. Per fare ciò occorrono le misure al 75% dei tre primari e del bianco, quindi io suppongo che siano misure a 75 IRE. I test patterns per queste misure non riesco a trovarli ed ho pensato di usare quelli di HCFR che sono usati per calibrare il loro colorimetro per un'analogia delle misure RGB e bianco con le misure richieste dal gamut calculator però non riesco a capire se sono a 75 IRE.
Comunque di seguito riporto l'help in linea del programma del gamut calculator dell'infocus.
InFocus Color Gamut Calibrator
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The InFocus Color Gamut Calibrator tool was designed to provide a mechanism for calibrators to override the projector's standard measured color gamut values. The measured color gamut values are in the CIE XYZ color space (also known as CIE 1931 color space).
Prepare To Calibrate
1. Turn on the projector and let it run for 15 minutes to allow the lamp to stabilize
2. Connect a null modem serial cable or a M1 cable (USB) to the projector
3. Once the lamp has stabilized, you are ready to start calibration
Calibrate
Start the Color Gamut Calibrator tool.
The Connection dialog is displayed first to allow you to pick your connection
If you connected the M1 cable for USB communication, select the InFocus IN78 device and click OK.
If you connected the null model serial cable, select the Serial Device # where # maps to the connected COM port. The serial configuration should be:
If you are properly connected, the status bar located at the bottom of the application will indicate which connection you are connected to. Otherwise, it will display Disconnected.
Verify that the Edit Mode is set to Measured Values. In this mode, the application will automatically normalize the luminance data for you.
IMPORTANT: Before performing any measurements, make sure that the Enable calibration mode checkbox is checked. This will disable any image processing algorithms that affect the color gamut measurements.
You are now ready to start your measurements. Please note that the luminance values can be in any units (lumens, lux, or footcandles) as long as they are the same for all color channels. The software will automatically normalize these values.
Using a 75% solid red image, measure and record the x, y, and luminance values in the red color gamut text boxes.
Using a 75% solid green image, measure and record the x, y, and luminance values in the green color gamut text boxes.
Using a 75% solid blue image, measure and record the x, y, and luminance values in the blue color gamut text boxes.
Using a 75% solid white image, measure and record the x and y values in the white color gamut text boxes.
Once you are complete, you can use the White Luminance Error to determine how accurate your measurements were. For optimal performance, it is recommended that the white luminance error is < +/- 2%.
Save your measurement values to a local file before continuing. Use File->Save to save the file
Next write the measurement values to the projector using the Write button. If successful, the status bar at the bottom of the application will display, "Measurement values written".
Calibration is now complete. Uncheck the Enable calibration mode checkbox to see your results.
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Other Features
Feature Description
Read The Read button will read the color gamut values from the projector.
NOTE: The projector does not store the red, green, blue, and white luminance values, so when a read is performed, the Edit Mode is automatically switched to Normalized Values. In this mode, the luminance values will equal the normalized luminance values.
Reset To Default The Reset To Default button will reset the projector's color gamut values back to their default values.
NOTE: If something goes wrong during calibration, this control will always get you back to the default values
Ciao
Enzo
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