Discussion:
iPhone captures on LCD monitor
(too old to reply)
Dale
2014-02-25 03:28:50 UTC
Permalink
http://en.wikipedia.org/wiki/Color_temperature

my sister has an iPhone, she takes pictures and they look like they have
a pleasant color temperature overall on the iPhone

when she emails these to me and I view them on my emachines monitor,
running Redhat Enterprise Linux KDE Thunderbird email, the pictures kind
of look very incandescent

they were originally captured under incandescent lighting

I don't know if the iPhone uses a scene balance algorithm, or just a
white point balance, that doesn't get exported

would seem like a typical proprietary grab, like sRGB and ProPhotoRGB
http://en.wikipedia.org/wiki/Srgb
http://en.wikipedia.org/wiki/ProPhoto_RGB

I can fix this in GIMP easy enough,
http://en.wikipedia.org/wiki/GIMP

but it really goes beyond the "good enough" color category for even
consumers I think

any one know what is actually happening here?

I can fix it easy. Get rid of sRGB and ProPhotoRGB and use an RGB
related more to the eye (CIE) than an output device or film
http://en.wikipedia.org/wiki/CIE_1931_color_space

its been 20 years since I first said at Kodak R&D that sRGB would mean
an easy out from the development of real device independent color
management workflows
http://en.wikipedia.org/wiki/International_Color_Consortium

yes, I learned since you need a wider gamut than an ideal print to
accommodate all applications, but there DOES need to be a RELATIVE
appearance, unless you are talking about "good enough" color, or "more
attractive" color, which can be handled in many ways, I think "accurate"
which is defined as CIE is a better starting point than video or film
http://en.wikipedia.org/wiki/CIE_1931_color_space
--
Dale
Dale
2014-02-25 03:39:40 UTC
Permalink
Post by Dale
any one know what is actually happening here?
okay, I might be getting the RAW image, preferred in some use cases but
probably not consumer use cases as default, and Redhat/KDE/Thunderbird
is not translating it probably

is Linux in/entering the ICC?
http://www.color.org/

since Linux is pretty much an open systems solution it might be the one
place where color management would be open systems too, as opposed to
sRGB (video) or ProPhotoRGB (film)
--
Dale
Dale
2014-02-25 04:01:32 UTC
Permalink
Post by Dale
is Linux in/entering the ICC?
forgot about this implementation
http://www.littlecms.com/

I think there was another one too ...

looks like there is a lot of activity
http://en.wikipedia.org/wiki/Linux_color_management

I guess "Linux" could not join ICC, it could be granted a general
membership though, allowing implementations of Linux or implementations
of Linux color management systems a say in ICC, just a thought

I hope Linux doesn't go the direction of sRGB (video) or ProPhotoRGB
(film) and sticks with CIE (eye), CIE does have an RGB if you insist on
not using colorimetry and spectral measurement

ICC has not managed the transition of the industry from device
measurement systems like densitometry or dot, to CIE colorimetry

and to repeat there does have to be a standard RELATIVE appearance in
most use cases, yes I have learned this cannot be a print since the
gamut is not big enough for transparencies and translucencies and
probably projectors and even most soft display

yes, there is "good enough" and "more attractive" color, but these must
start from a design of "accurate" color, c'mon it's been 25 years I think
--
Dale
Dale
2014-02-25 04:08:07 UTC
Permalink
Post by Dale
I guess "Linux" could not join ICC, it could be granted a general
membership though, allowing implementations of Linux or implementations
of Linux color management systems a say in ICC, just a thought
maybe this could be the driver to "finally" get a CIE(eye) system
developed as opposed to sRGB(video) ProPhotoRGB(film) proprietary grabs
within the ICC

CIE does mean a measurement transition from device measurements like
densitometry and dot, to colorimetry and spectral systems, maybe there
are interested parties here

I'm done talking to myself for tonight (on these groups) :)
--
Dale
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