Re: Questions on some basic definitions and concepts.
Re: Questions on some basic definitions and concepts.
- Subject: Re: Questions on some basic definitions and concepts.
- From: Andrew Rodney <email@hidden>
- Date: Mon, 10 Mar 2014 08:43:09 -0600
1. Standard Illuminants were created from a pretty large number of differing locations and averaged. Certainly NOT just the daylight in Washington DC at the time specifed. I've got an email from this list a few years back specifying the various locations and I'll see if I can dig it up. But the idea it's one measurement taken in one location at one time doesn't seem correct.
2. My take is a color space is a specific recipe of a color model, a color model is a much broader way to discuss the multiple color spaces. As such I consider RGB a color model like CMYK and Lab. I consider Adobe RGB (1998) to be a color space within the RGB color model. SWOP V2 is a specific color space within the CMYK color model. Best way to compare them visually using graphs or numerically if that's your thing would be with ColorThink from CHROMIX.
Andrew Rodney
http://www.digitaldog.net/
On Mar 10, 2014, at 8:20 AM, matthew ward <email@hidden> wrote:
> 1. A textbook with a chapter on color theory (the book itself is not about color technology) has a reference for daylight but I haven't been able to find the source for this reference. Here it is:
>
> " A full-spectrum light source, as recommended, is one with a color temperature close to 5500 K (D55) that is specifically balanced throughout the visible spectrum. This light source is defined as equivalent to daylight in Washington D.C. (Bureau of Standards) in the month of June, during the hours of 12:00 noon to 1:00 pm, when there is a slightly overcast sky; the CRI of this light source should be 90 or higher. "
>
> Do any of you know the source for this reference ?
>
>
>
> 2. I have been trying to understand the difference between a color model and a color space but haven't found any text or any source that provides a good definition for either one or explains both in a manner that is clear and simple to understand. I am trying to understand the following:
>
> 2.a. Is Lab a color model or a color space ?
>
> 2.b. Is the Munsell Color system a color model ? In this case is the Lab a color space based on the Munsell color system (color model) ?
>
> 2.c. Is RGB a color space ?
>
> 2.d. How can I draw graphs comparing the color spaces defined by RGB, Adobe RGB and ProColor ? In case I have a raw file created by a 12-bit and another created by a 14-bit camera, how can I draw a graph depicting the difference in the color spaces of these two cameras ?
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