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  • Subject: Re: [iris-photos] Re: NOIDS
  • From: John I Jones jijones@usjoneses.com
  • Date: Thu, 1 Sep 2005 22:22:32 -0700

On Sep 1, 2005, at 5:18 AM, Robt R Pries wrote:

> John: I would also add to your note that verbal descriptions in the 
> checklist bring different thoughts to different people. What I call 
> maroon may not be the same as what you call maroon. Of course no Iris 
> is really red or blue. Yet many of us see blue when we want to.

Or pink in a spuria...

> Personally I think that is better than seeing red. Lets face it trying 
> to communicate anything is often very difficult.




> John I Jones <jijones@usjoneses.com> wrote:At the risk of being a 
> spoil sport, I have to give one of my periodic
>> soundings about identifying irises from digital pictures.
>> Lets begin with the garden: The same cultivar will look slightly
>> different depending on the conditions of the soil in the different
>> gardens.
>> Now about taking the picture: Different cameras (either digital or
>> conventional) take pictures with different casts to them. Different
>> times of day make an iris look very different in an image. When you
>> compress an image into a jpeg file, youchange the color slightly
>> (although probably not noticably on the standard monitor).
>> Lets say you scan a picture, different scanners scan pictures with
>> different casts to them.
>> The magic monitor: Even if I could get a scan of a color chip from a
>> standard set (like the RHS color set) to look the same on my monitor 
>> as
>> the chip looks itself, unless I had a very expensive color calibration
>> device for my monitor, and you had a similar device, both of us having
>> very expensive monitors, the color you would see on your monitor would
>> probably look very different from the way it appeared on mine.
>> I have two large, reasonably high end, identical monitors on my system
>> (no color calibrators) connected to two different interfaces (made by
>> the same company) and the same picture looks very different on the 
>> two.
>> Until the technology improves, you just cannot use any digital image 
>> to
>> compare colors, or identify a particular iris. The best you can do is
>> get a list of candidates to grow right next to the NOID and see then 
>> if
>> they are the same.
>> John the grinch
John                | "There be dragons here"
                          |  Annotation used by ancient cartographers
                          |  to indicate the edge of the known world.

List owner iris@hort.net and iris-photos@yahoogroups.com
USDA zone 8/9 (coastal, bay)
Fremont, California, USA
Director, American Iris Society
Chairman, AIS Committee for Electronic Member Services

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