Re: "Color Chart" application for the iPhone and iPod Touch
Re: "Color Chart" application for the iPhone and iPod Touch
- Subject: Re: "Color Chart" application for the iPhone and iPod Touch
- From: Richard Baguley <email@hidden>
- Date: Sat, 06 Jun 2009 10:30:24 -0400
Ray, I haven't tried this application, but I would agree with your
overall sentiments; I don't see how this application will be useful if
there is no way to specifically calibrate it.
I haven't tested the specifics of the gamut that the iPhone screen can
manage, but I did test the color temperature of several iPhone screens
for an article when the 3G version came out, and found that they varied
hugely, both in color temperature and brightness:
http://www.wirelessinfo.com/content/iPhone-3G-Screens-Are-Brighter-And-More-Yellow.htm
Ray Maxwell wrote:
Hi Group,
I wrote the following review of the "Color Chart" application that is
offered for the iPhone via the iTunes store for $4.99. I would
appreciate any comments you might have about this application and/or my
review. We will have to wait and see if they publish my review.
Thanks,
Ray Maxwell
**********************************
Review of the "Color Chart" application:
I have paid $4.99 for the privilege of writing this review. I have some
serious questions about the usefulness of this application.
The author of this application says “Specially calibrated by
professionals for your device, Color chart features 24 Colors with
displayable RGB values, exposure control, and Red, Green, and Blue
Adjustments.” I would ask how they calibrated MY iPod Touch and how they
know what brightness setting I am using?
RGB values do NOT define a color without specifying the color space
(sRGB, Adobe RGB 98, ProPhoto RGB). They don’t specify what color space
they are working in. Color is specified by CIELab values. There is no
mention of this in the instructions.
The spectral properties of the backlit LCD in the iPhone are nothing
like the spectral properties of pigments in artwork or a Macbeth color
chart. Making the colors on your iPhone match your monitor or printer
will not make art pigments or skin tones match in various kinds of light.
Has the author of this application shown that ALL iPhones and iPod
Touches have the same color characteristics? I use a colorimeter or
spectrophotometer to calibrate and profile my computer monitor. I do
this at least once a month since monitors drift. I also lock the
brightness control before I calibrate the monitor. The instructions make
no mention of what brightness setting to use. The ambient light also
makes a difference as to how the colors will appear.
While this application may be fun to play with and give you a very rough
color target, it will not give you a very accurate color target that is
required by professionals.
For more information…read “Real World Color Management” by Bruce Fraser.
Ray Maxwell
Retired Electronics Engineer
Past color scientist for Creo Inc. now owned by Kodak
I have worked with the top color scientists at Kodak, Dupont, Imation,
and Fuji
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--
Richard Baguley
Vice President of Editorial Development
Reviewed.com
Digitalcamerainfo.com, Camcorderinfo.com, Wirelessinfo.com, Printerinfo.com
Phone: +1 617 848 9008
Fax: +1 617 848 9012
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