ChromaPure with Display 3 PRO (Rev B) Colorimeter
Officially known as the i1 Display Pro III, by any definition X-Rite’s colorimeter is a disruptive technology. In many ways, it is not useful to think of this meter as simply a successor to the Display 2, which was the dominant affordable colorimeter on the market for several years. The i1 Display Pro III (Display 3) is based on a completely different design and offers a level of performance profoundly superior to the Display 2, indeed profoundly superior to any colorimeter at anywhere near the MSRP price of $269.
For a full review of the Display 3 colorimeter, see New Gear.
It is also an easy device to use because it requires neither a dark reading calibration nor external drivers (support is built-in to Windows).
Despite this, it is an affordable mass-market device whose tolerances fall short of professional color analyzers.
The Rev B version of this meter differs from the original version by including new hardware/firmware features that allow for refresh rate detection and synchronization at the time of meter initialization. This version of the meter is indicated by the presence of B in the serial number.
We have developed a version of the Display 3, which we have named the Display 3 PRO, that offers substantially enhanced accuracy across a wide range of displays.
Using a professional 2nm sptroradiometer, we correct each Display 3 PRO for 13 different display types. These corrections are built-in to the ChromaPure license file. When you initialize the meter within ChromaPure you are asked to select the measurement mode that represent the display types for which the meter has been corrected. Selecting a measurement mode automatically applies the appropriate correction. This way, the $269 colorimeter can approach the accuract of a $17,000 2nm spectroradiometer. To understand more about this, it is important to first understand the source of errors in tristimulus colorimeters.
In an attempt to accurately model human color vision, in 1931 the CIE defined the standard observer, which is characterized by three color matching functions, shown below.
A filter-based colorimeter attempts to mimic human color perception by matching these curves. However, accurately matching these complex curves using any reasonably affordable filters requires correction with a reference spectroradiometer. Otherwise, you cannot achieve the desired accuracy with different display types. A spectroradiometer does not rely on filters as a way of mimicking human color vision, but rather measures the spectra of a display directly. Its accuracy depends only on the bandwidth, sensitivity, and resolution of the device.
The inaccuracies of a filter-based colorimeter arise from a variety of sources.
Taken together, these four sources of inaccuracy—generic factory calibration, unit-to-unit variation, effects from aging, and a lack of consistency among displays—result in a device that, on average according to our tests, typically deviates from a reference spectroradiometer up to about 5-6 dE (CIELAB). Our PRO version of the meter will cut this source of error considerably.
The Display 3 PRO virtually eliminates 3 of the 4 sources of error and lessens the fourth for a small fraction of the cost of a true reference device.
Of course, the best way to minimize these errors is to use your own reference spectroradiometer to correct the Display 3 for each calibration session on a single display. ChromaPure provides an Meter Correction module for just this purpose. However, the vast majority of consumers cannot afford a true reference device, which are very expensive. SMPTE requires a reference instrument to have a minimum accuracy of ±0.002 for the measurement of xy chromaticity coordinates at any luminance above 3 fL. The only instrument capable of this level of precision is a 5nm or better spectroradiometer. A tristimulus colorimeter will not offer this level of accuracy, nor will an 8nm or 10nm spectroradiometer.
The Display 3's accuracy is reasonably consistent when reading CRTs, plasmas, and front projector screens. The biggest problem by far lies with LCDs. Using the Standard mode the Display 3 may read one LCD very accurately and yet be off on another. It is difficult to achieve consistency when reading LCDs. Contrary to one widely-repeated myth, this is not an issue directly related to the difference between CCFL backlit and LED backlit displays. Some LED displays actually give the colorimeters less trouble than their CCFL counterparts. Also, the Display 3 can maintain considerably different levels of accuracy when comparing two CCFL displays. The problem isn't with LED backlighting. The problem is LCDs period. To address this problem, the Display 3 PRO ships with 8 different LCD modes. We may add additional LCD modes as needed.
This meter is offered by X-Rite in three configurations.
Currently, ChromaPure supports both the OEM and the Retail version of the i1 Display Pro III. We do not support the ColorMunki Display.
The result? The Display 3 PRO is a colorimeter that offers professional grade performance at a price affordable to the amateur hobbyist or enthusiast. Our tests show that the Display 3 PRO offers accuracy for color and the white point that in the majority of cases exceeds that of the i1Pro. Furthermore, its luminance readings are far superior to the i1Pro, both in terms of general accuracy and certainly in dynamic range.
Quite simply, we believe that this is the best sub-$1000 meter for video calibration on the market today. Is it a true reference device? No. But at this price it comes as close as any device we are aware of to this standard.
For best accuracy, we recommend calibrating front projectors by taking readings directly off the screen. However, for those who wish to take readings directly from a projector's lens, the Display 3 offers a built-in color neutral diffuser.