Re: Media Testing for maclife.de
Re: Media Testing for maclife.de
- Subject: Re: Media Testing for maclife.de
- From: "edmund ronald" <email@hidden>
- Date: Wed, 10 Sep 2008 16:10:49 +0200
On Wed, Sep 10, 2008 at 11:57 AM, Bob Frost <email@hidden> wrote:
> Edmund,
>
> For those of us who are not color scientists, but photographers, when you've
> stopped ROTFLing would you explain the joke in a little more detail please.
>
> Thanks,
>
Here is a pointer to the spectrum of a fluorescent lamp
http://www.pl.euhou.net/docupload/files/Excersises/WorldAroundUs/Spectroscope/Spectra/Fluorescent_lighting_spectrum_labelled.gif
Taken from
http://www.euhou.net/index.php?option=com_content&task=view&id=179&Itemid=13
As you can see, the spectrum of a fluorescent lamp is very spiky. The
color temperature may be 5000K or similar, but the way it is achieved
is really ugly. A camera caracterisation made with such an illuminant
is as much a caracterisation of the light as of the camera. Of course,
the resulting "profile" will work very nicely in fluorescent-lit
offices, which is where programmers tend to sit. I think that before
accusing Ulli of being "unscientific", Adobe should take a hard look
at their own past methods and practices when establishing their
profiles. Adobe may have had a good model -the DNG 2-matrix approach-,
but they combined it with bad experimental practice to match it with
reality.
Edmund
> Bob Frost.
>
> ----- Original Message ----- From: "edmund ronald" <email@hidden>
>>
>> Thomas Knoll, who is a stellar programmer, publicly described how he
>> created the numbers for the original DNG matrices by measuring camera
>> under different illuminants *in a lightbooth*
>>
>> ROTFL
>>
>> I hope the color scientists on this list haven't exploded from
>> excessive laughter at this point. Please, if you dropped your teacup,
>> don't sue me.
>
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