Re: untagged RGB data
Re: untagged RGB data
- Subject: Re: untagged RGB data
- From: email@hidden
- Date: Sat, 20 Dec 2003 22:13:43 EST
Andrew,
I don't know if its crazy or not, but I'm in general agreement with you. I
prefer to separate the encoding from the rendering for hi-end workflows. For
amateur workflows, combining them has a significant productivity and simplicity
advantage. But an ICC profile does more than describe the device colorimetry.
There is an implied rendering (to the reference medium), and you do have
multiple rendering intents.
While I don't particularly agree with the approach, what the camera makers
are doing with sRGB is not that far fetched. You could think of it as different
rendering intents expressed as different sRGBs. Ugh! And its not really "the
conversion INTO sRGB that accounts for the differences". The conversion is
composed of the encoding and the rendering. Its the rendering that accounts for
the difference. This part really doesn't have much to do with ICC profiles. In
fact, they tend to use the EXIF sRGB colorspace specifier to denote sRGB,
circumventing ICC profiles altogether.
Eric Walowit
Tahoe
In a message dated 12/20/2003 7:56:30 AM Pacific Standard Time,
email@hidden writes:
on 12/20/03 8:25 AM, email@hidden wrote:
>
Simply encoding
>
input-referred sensor data as sRGB, while mechanically easy, isn't really
sRGB
>
since the output-referred rendering is omitted. Its because of this
rendering
>
step that we have so many flavors (different renderings) of sRGB.
That just seems crazy to me. The whole idea of a device profile is supposed
to describe the color the device creates. The whole idea of a colorspace
like sRGB is it's got a certain "DNA" that makes it different from all other
colorspaces. What you're saying is fascinating but also very unsettling. Is
this all within the ICC spec or did these camera manufacturer just make a
big Frankenstein monster out of all this?
>
Different
>
camera modes or matrices render differently into sRGB.
Ah! So it's the conversion INTO sRGB that accounts for the differences? That
makes a bit more sense.
In the end, I have to wonder if having more than one input method for
conversion into the same space (sRGB) is a good idea. And why (thankfully)
only one rendition of Adobe RGB (in nearly all the cameras that provide
multiple sRGB)?
Andrew Rodney
http://www.imagingrevue.com/
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