[argyllcms] Re: DIY color target for photographers
- From: edmund ronald <edmundronald@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sun, 16 Oct 2011 12:17:19 +0200
Apologies... I'm sure Argyll can also be used to measure and make a CGATS
file from patches - Argyll can do anything :)
Edmund
On Sun, Oct 16, 2011 at 12:15 PM, edmund ronald <edmundronald@xxxxxxxxx>wrote:
> +1 to everything Graeme says.
>
> I think if you have a spectro, I'd guess you can do just about as well
> yourself by printing out an image of a target, measuring it and using it as
> a profiling target. I'd keep the print it in a nice box to prevent it's
> getting damaged, though. But if you keep a ColorChecker in a box it doesn't
> get damaged either ...
>
> The nice thing about Passport is that it has sturdy packaging precisely in
> order that it should be usable in the field; the problem is it is too small
> for visual comparison when you get back home.
>
> BTW, if you need to measure a bunch of patches manually, I think ColorMunki
> can do it, and Danny Pascale's PatchTool excels at it.
>
> Edmund
>
>
> On Sun, Oct 16, 2011 at 6:20 AM, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote:
>
>> Lars-Daniel Weber wrote:
>>
>> I want them for photos, not for scanners:
>>>
>>
>> Anything created using a printer is likely to be less than optimal for
>> general
>> photography. There are two related issues, gamut and spectral similarity.
>> A printer
>> typically uses a small number of inks (typically CMYK), and this both
>> limits the
>> gamut and the spectral shapes used to create the colors. A printed color
>> may appear
>> to be the same as one you might find in a photographic scene, but in fact
>> might be
>> composed of quite different spectra. This is important when the object of
>> a camera
>> profile if the camera sensor spectral sensitivities are different to the
>> human eye
>> (which is typically the case).
>>
>> So making a high quality chart intended for camera profiling is no easy
>> task. For each
>> test color you really need to select a pigment combination that matches
>> the real world
>> color that it represents. The distribution of colors selected should also
>> represent the
>> distribution of colors as you will find them in the real world.
>>
>> Graeme Gill.
>>
>>
>
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