Re: input camera porifles
Re: input camera porifles
- Subject: Re: input camera porifles
- From: Andrew Rodney <email@hidden>
- Date: Wed, 31 May 2006 06:50:08 -0600
- Thread-topic: input camera porifles
On 5/30/06 8:00 PM, "eugene appert" wrote:
> This is probably good advice but I wonder, though this kind of profile may
> zap a target into shape does that necessarily mean it¹s accurately
> characterizing the full range of a device¹s spectral response.
I'd say not. Look at the gamut of the target used to build a profile and
compare that to the gamut (potential gamut) of anything you place in front
of the sensor.
> For example
> wouldn¹t it be fair to say that if the camera¹s sensitivity extended beyond
> Adobe 1998 in any direction,
I will say I have LOTs of images of scenes that when viewed in Adobe Camera
RAW using it's saturation histogram clip gamut in Adobe RGB (1998). I often
have to use ProPhoto RGB to encode the colors rendered.
> Since raw format cant be profiled I am assuming that you mean that you
> assign a camera profile to the tif file after raw conversion or you are
> using a raw converter such as Phase One Capture that allows for third party
> profiles to be assigned during conversion.
You can't profile a RAW file (its a Grayscale file to begin with). You can
profile the rendered image from a RAW converter (you're defining its
encoding color space). You would want to do this with a product like Bibble
or RAW Developer that allow you to get to the least processed (rendered)
image state. In RAW Developer, you can turn off nearly all the color
rendering controls as noted:
" RAW Developer performs all adjustments available on the "In" tab panel of
the Settings window basically in camera native color space. Technically once
the first image processing operations are performed the color information is
no longer strictly "camera native", but this term may also be used loosely
to mean the color information prior to any color transformation through the
camera input profile. When the Disable all processing..." checkbox is
checked on the "In" tab panel you are able to view the image in "camera
native" space without any color matching being performed and can inspect the
values in the histogram window and the pixel value RGB read out in the Image
Window as well".
>From that rendered file, you'd send that target (again with a fixed color
gamut) through your profile building package and then load and use it in RAW
Developr. But such a workflow would not work and would be counter productive
in a product like Aperture, Lightroom or ACR (and I would submit it's not
necessary for a lot of users).
Andrew Rodney
http://www.digitaldog.net/
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