[argyllcms] Re: Eye-one and DTP94 using dispcal
- From: "edmund ronald" <edmundronald@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 4 Aug 2008 10:58:52 +0200
When the internal light source is off the EyeOne Pro calibration base
acts as a light-proof cap, allowing estimation of the black level.
I believe an instrument needs to do a black-level calibration for
emissive readings. For reflective readings both a black-level
calibration and a calibration with illuminant on, measuring the white
tile are necessary.
Edmund
On Mon, Aug 4, 2008 at 9:38 AM, Gerhard Fuernkranz <nospam456@xxxxxx> wrote:
> Martin Weberg wrote:
>>
>> Is it Argyll that requests "placing the black cap" on?
>>
>>
>> Yes, and "place in on a dark surface or place on the white calibration
>> reference".
>
> That's for black calibration, i.e. the response of the instrument to
> "absolutely no light" is measured and remembered, in order that the
> offset can be subtracted from subsequent readings.
>
> -Gerhard
>
>
>
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