ColorChecker SG - AcrCalibrator

Message from discussion ColorChecker SG
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Date: Sun, 14 Jun 2009 13:46:55 -0500
Message-ID: <2113915c0906141146l7aa49b83rf9af53d53f2c1...@mail.gmail.com>
Subject: Re: [acrcal] ColorChecker SG
From: steve sprengel <steve.spren...@gmail.com>
To: acrcalibrator@googlegroups.com

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The ACR Calibrator script only uses 3 of the color-patches (red, green,
blue) to do its calibration so most things would do a better job; however,
since the script is merely tweaking an existing color-profile, it may not be
that bad.

Adobe Labs has released the free DNG Profile Editor that uses all 24 squares
to create a new camera profile (rather than tweaking an existing profile),
and I use this, now, not the script.  You can create a single-color-table
profile that works for a particular lighting situation, as well as the
dual-color-table profiles that work for most lighting situations because ACR
interpolates between the two color-tables in the profile the same as they do
with the stock color profiles.

http://labs.adobe.com/wiki/index.php/DNG_Profiles
http://labs.adobe.com/wiki/index.php/DNG_Profiles:Editor

I don't have any experience with the EyeOne Match software to know what it
does and how well it works, but if it uses many color patches, it should do
a reasonable job.  If it doesn't create a dual-color profile then it may
only be useful for single-color-lighting situations, rather than a more
universal application like Adobe's dual-color profiles.  For studio work a
single-color profile would be

I have created color-error plots showing the errors for each of the 24
color-patches for both the script and the DNG Profile Editor for various
lighting situations using a program called Imatest which you can view, here:

http://www.pbase.com/ssprengel/_tech_adobecalibration

The thing to see from such color-error plots is that the color-error is not
the same across all colors with some colors being almost perfect and some
having quite a bit of error.  In professional work, for portraits you want
the skin-tones to look good, and in catalog work, you want the textile
colors to be correct, so the fact that all colors aren't quite right is not
big a concern, but in general it would be nice to have the colors close.
This optimization of pariticular colors at the expense of others is what the
calibration sliders are for in the first place and is actually the main
purpose of the DNG Profile Editor--to tweak a profile so particular profiles
are perfect.

With the newer ACR versions, such as you have with CS4, Adobe has released
several different color-profiles for each Canon and Nikon camera model they
support to make different situations look good.  For example, the portrait
profile makes the skintones look good, and the landscape profile
oversaturates the greens and the blues to make sky and foliage look good.
These are called camera-match profiles because they try to mimick the
typical scene-modes that various camera manufacturers supply for the
in-camera JPG conversion.  At the point that Labs released the DNG Profile
Editor, these camera-match profiles were in beta and you could download and
install them from Labs, but now ACR comes with these profiles and you don't
want to install the betas which would just yield duplicates.


On Sun, Jun 14, 2009 at 11:53 AM, Antonio <ans...@gmail.com> wrote:

>
> I have the 24 patch ColorChecker and the 140 patch Colorchecker SG
>
> I have done a successful calibration using AcrCalibrator and the 24
> patch ColorChecker.
>
> Will I get a substantially better camera profile/calibration if I use
> the Colorchecker SG and the EyeOne Match software?
>
>
> Thanks,
>
>
> Antonio
> >
>

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<div>The ACR Calibrator script only uses 3 of the color-patches (red, green=
, blue) to do its calibration so most things would do a better job; however=
, since the script is merely tweaking an existing color-profile, it may not=
 be that bad.</div>

<div>=A0</div>
<div>Adobe Labs has released the free DNG Profile Editor that uses all 24 s=
quares to create a new camera profile (rather than tweaking an existing pro=
file), and I use this, now, not the script.=A0 You can create a single-colo=
r-table profile that works for a particular lighting situation, as well as =
the dual-color-table profiles that work for most lighting situations becaus=
e ACR interpolates between the two color-tables in the profile the same as =
they do with the stock color profiles.</div>

<div>=A0</div>
<div><a href=3D"http://labs.adobe.com/wiki/index.php/DNG_Profiles">http://l=
abs.adobe.com/wiki/index.php/DNG_Profiles</a></div>
<div><a href=3D"http://labs.adobe.com/wiki/index.php/DNG_Profiles:Editor">h=
ttp://labs.adobe.com/wiki/index.php/DNG_Profiles:Editor</a></div>
<div>=A0</div>
<div>I don&#39;t have any experience with the EyeOne Match software to know=
 what it does and how well it works, but if it uses many color patches, it =
should do a reasonable job.=A0 If it doesn&#39;t create a dual-color profil=
e then it may only be useful for single-color-lighting situations, rather t=
han a more universal application like Adobe&#39;s dual-color profiles.=A0 F=
or studio work a single-color profile would be </div>

<div>=A0</div>
<div>I have created color-error plots showing the errors for each of the 24=
 color-patches for both the script and the DNG Profile Editor for various l=
ighting situations using a program called Imatest which you can view, here:=
</div>

<div>=A0</div>
<div><a href=3D"http://www.pbase.com/ssprengel/_tech_adobecalibration">http=
://www.pbase.com/ssprengel/_tech_adobecalibration</a></div>
<div>=A0</div>
<div>The thing to see from such color-error plots is that the color-error i=
s not the same across all colors with some colors being almost perfect and =
some having quite a bit of error.=A0 In professional work, for portraits yo=
u want the skin-tones to look good, and in catalog work, you want the texti=
le colors to be correct, so the fact that all colors aren&#39;t quite right=
 is not big a concern, but in general it would be nice to have the colors c=
lose.=A0 This optimization of pariticular colors at the expense of others i=
s what the calibration sliders are for in the first place and is actually t=
he main purpose of the DNG Profile Editor--to tweak a profile so particular=
 profiles are perfect.</div>

<div>=A0</div>
<div>With the newer ACR versions, such as you have with CS4,=A0Adobe has re=
leased several different color-profiles for each Canon and Nikon camera mod=
el they support to make different situations look good.=A0 For example, the=
 portrait profile makes the skintones look good, and the landscape profile =
oversaturates the greens and the blues to make sky and foliage look good.=
=A0 These are called camera-match profiles because they try to mimick the t=
ypical scene-modes that various camera manufacturers supply for the in-came=
ra JPG conversion.=A0 At the point that Labs released the DNG Profile Edito=
r, these camera-match profiles were in beta and you could download and inst=
all them from Labs, but now ACR comes with these profiles and you don&#39;t=
 want to install the betas which would just yield duplicates.</div>

<div>=A0</div>
<div>=A0</div>
<div class=3D"gmail_quote">On Sun, Jun 14, 2009 at 11:53 AM, Antonio <span =
dir=3D"ltr">&lt;<a href=3D"mailto:ans...@gmail.com">ans...@gmail.com</a>&gt=
;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote"><br>I have the 24 patch ColorChe=
cker and the 140 patch Colorchecker SG<br><br>I have done a successful cali=
bration using AcrCalibrator and the 24<br>
patch ColorChecker.<br><br>Will I get a substantially better camera profile=
/calibration if I use<br>the Colorchecker SG and the EyeOne Match software?=
<br><br><br>Thanks,<br><font color=3D"#888888"><br><br>Antonio<br>
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