Re: camera colour spaces
Re: camera colour spaces
- Subject: Re: camera colour spaces
- From: Karsten Krüger <email@hidden>
- Date: Wed, 12 Mar 2008 16:06:17 +0100
Paul,
Am 12.03.2008 um 16:01 schrieb info:
Andrew Rodney wrote:
Correct but these are NOT ICC profiles.
Then this must be the answer to my question that started this post.
Which was..
"I am curious about how semi-professional digital cameras manage the
"colour space " configuration which it imposes on operator's using
jpeg format".
Could I make the following statement. In-camera rendering prior to
jpeg formatting uses a generic profile (which is not ICC ) to
characterise the device capture and builds upon this profile in much
the same way operators "tweak" raw conversion using a raw converter,
towards a desired colour effect. Once this non ICC profile and
conversion settings have been applied, the data is then converted to
the targeted colour space.
If this is at least close, could you please point me to references
that describes in detail these non ICC profiles, what they are, how
they are made and how they are used in this rendering process.
This is not close. It is more or less like "when the sensor has
voltage x on this pixel, voltage y on that pixel and voltage z on a
third one, then put RGB a,b,c into the corresponding pixel of the
image matrix". There is no color management like we are used to in
Photoshop involved. And we don't have access to this process. The
values written into the image matrix are from a translation table that
can be replaced for different output specifications. Inside of the
camera there is no math happening on this (to slow).
If those translation tables are done by math or heuristic approach is
a matter of the camera developer and again, we don't have access to
this and we can not change anything here. There is currently some
pressure on camera manufacturers to support eciRGB v.2 or an other L-
Star based output gamut (see Edmund's post recently), but again we are
at mercy of the camera manufacturer. And it is less likely that they
will follow because the target market of those cameras is the home
user where you will find inkjet printers which try to match sRGB.
You might compare this to a modern car's engine. All controlled by
digital circuts. Some people have figured out how they work thru
reverse engineering. Now they replace some control tables, but at what
costs ? You have to shell out $1.000 for installation and loose all
warranties. Now put this to cameras. Spend $1.000 for the modification
and loose warranties on an item worth $300. Makes no sense in the
light of RAW converters for a lot less than $1.000...
Karsten
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