Re: HP Dreamcolor Display: So far, so good.
Re: HP Dreamcolor Display: So far, so good.
- Subject: Re: HP Dreamcolor Display: So far, so good.
- From: email@hidden
- Date: Mon, 29 Sep 2008 05:01:21 EDT
Simply put, if you know what you are measuring, you can tune either a
spectral device or a colorimeter device to well-reproduce what you are likely to
measure. Its similar in concept to the discussion we had recently about camera
profiling. Think of the monitor calibrator as a simple camera. The colorimeter
has only several bands while the spectral device has many. But since no device
perfectly satsifies the Luther condition, the device has to be calibrated (kind
of profile) for the likely scene (monitors) to get the best performance.
Since the spectral device has more bands, this argues for going spectral for the
better accuracy, in principle. Unfortunately, as with many things in life, it
comes down to signal/noise. Since the bands of a spectrophotometer are much
narrower than that of a colorimeter, the signal reaching the detector is much
less. So at a similar price, all else equal, the spectral device will have better
accuracy at higher signal levels, but the colorimeter may well outperform at
lower signal levels. So at lower price this argues for the colorimeter.
However, if the spectral properties of the target monitors are extremely well
characterized (and I do mean extremely well), if the colorimeter is well-designed
for high SNR, if the filters are well-tuned to the monitor spectral properties,
and if the calibration is well-optimized, then the colorimeter can well
outperform the spectral device, sacrificing mainly flexibility. Going back to the
camera profile anaolgy, its like tuning the camera profile to work well on
scenes and the cost of chart reproduction, or vice versa.
Eric Walowit
Koln
Marco Ugolini wrote:
> Also, I remember hearing something from Bruce Fraser years ago about why a
> "tuned" colorimeter is better at monitor profiling than a
spectrophotometer.
> I wish I had a better memory of the reasons why that is so. Can anyone
help?
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