Digital BW, The Print

koloshor wrote:


>>Some older spectrophotometers 
>>used prisms rather than gratings. The X-Rite 810 etc would fit the 
>>category of colorimeter.
> 
> 
> All the filtering is done on the received light, typically a diffraction grating in front of a small linear CCD. This allows the spectrophotometer to do double duty, measuring the spectra of emissive targets such as CRT and LCD monitors, or the spectrum of the light in one's print viewing environment. For print densitometry, the spectrophotometer contains a small white light source (which typically has a spectrum that includes ultraviolet, because papers have flourescent brightners added). 

But some models can be bought with UV filters on the light source 
and in some cases in front of the sensor. So three models in total.

Ernst