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Darren Plester
Member
Username: Dplester

Post Number: 45
Registered: 09-2005
Posted on Sunday, April 05, 2009 - 02:01 am:   Edit Post Delete Post

I was wondering, when a RAW image is converted to a 48 bit RGB image, what order is the Color, Gray, Sharpening and Noise reduction executed in?

For example, is sharpening applied before noise reduction is applied? Or is the noise reduction applied first, then the image is sharpened?

Darren.
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Maciej Tomczak
Member
Username: Tomczak

Post Number: 513
Registered: 08-2004
Posted on Tuesday, April 07, 2009 - 06:25 am:   Edit Post Delete Post

As the RAW is processed, PWP displays the current operation. If you process a large RAW file on a slow computer (or have some other heavy process running concurrently) it's pretty easy to see in which order the steps are applied.
Maciej Tomczak
www.phototramp.com
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MJDL
Member
Username: Mjdl

Post Number: 7
Registered: 01-2009
Posted on Tuesday, April 07, 2009 - 04:21 pm:   Edit Post Delete Post

These are the messages that whiz past in opening an Olympus ORF raw file:

1) Load image
2) Creating mosaic
3) Scaling colors
4) Creating preview image
5) Converting to RGB
6) Adjusting gamma, levels, and color
7) Converting color space
8) Resizing

When some level of highlight recovery is selected, then steps 3-8 are repeated with the highlight recovery inserted after 4.

This all seems very reminiscent of what DCRAW does, so perhaps the DCRAW tutorial at http://www.guillermoluijk.com/tutorial/dcraw/index_en.htm has some use for understanding these steps; and http://www.rags-int-inc.com/PhotoTechStuff/Pipeline/ is a very good explanation of the different factors and choices in the digital camera image processing pipeline. I've only passed over those pages lightly, so I don't think I can really answer questions about this topic.

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