Re: camera colour spaces
Re: camera colour spaces
- Subject: Re: camera colour spaces
- From: email@hidden
- Date: Fri, 7 Mar 2008 15:28:47 EST
<< I am still unclear about where this "rendering " takes place and whether
it replaces the use of input camera profiles.>>
Depends on workflow:
1) If in-camera jpg,tiff, etc., then the rendering is done in-camera in the
conversion from sensor signals to the jpg or tiff. Rendering and encoding is
controlled by in-camera user settings.
2) If RAW, most RAW converters control the rendering from RAW (~sensor
signals plus meta data but not generally an ICC profile). First look is generally
controlled by honoring the camera settings, but software-based user controls
determine the final rendering and color space.
3) Custom ICC profiles should be done from RAW or rare (input is unrendered)
but some profilers do operate on already-rendered data.
<<If no input profiles are used how are the specific primaries or effective
dynamic range factored in? Even if a specific output reproduction curve, or
white point is envisioned for this "rendering" what dynamic range or
characteristic curve is assumed as source?>>
Usually by comparing image-specific information with the color image encoding
parameters for the intended output color space.
Eric Walowit
Tahoe
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