Vuescan Raw setting

  • Thread starter Thread starter Forest
  • Start date Start date
Are there any settings in Vuescan that would effect a raw scan ?

Yes, when using an ICC Profile and the "Output|Raw output with" is set to
"Save".

In an e-mail Ed Hamrick wrote to me:
----------------------------------------
It turns out that the "Color|Scanner color space" option affects
the raw image data when "Output|Raw output with" is set to
"Save". VueScan produces profiles that attempt to correct for
a non-linear CCD response, and the scanner profile can have
a gamma between 0.95 and 1.05. This non-linearity
correction is being done on the data before being written with
the scan.

It's best to save the raw file at the same time as the scan.
----------------------------------------

There were two treads in this newsgroup "comp.periphs.scanners" starting in
October 2003 with the subjects:
"Colours way of when scanning the Raw file of the same slide in VueScan"
"VueScan raw file is not a true raw file!"

If you are interested I advice to do a newsgroup search with Google on those
two subjects.

With kind regards,
Henk de Jong
 
Henk de Jong said:
Yes, when using an ICC Profile and the "Output|Raw output with" is set to
"Save".

In an e-mail Ed Hamrick wrote to me:
----------------------------------------
It turns out that the "Color|Scanner color space" option affects
the raw image data when "Output|Raw output with" is set to
"Save". VueScan produces profiles that attempt to correct for
a non-linear CCD response, and the scanner profile can have
a gamma between 0.95 and 1.05. This non-linearity
correction is being done on the data before being written with
the scan.

It's best to save the raw file at the same time as the scan.
----------------------------------------

There were two treads in this newsgroup "comp.periphs.scanners" starting in
October 2003 with the subjects:
"Colours way of when scanning the Raw file of the same slide in VueScan"
"VueScan raw file is not a true raw file!"

If you are interested I advice to do a newsgroup search with Google on those
two subjects.

With kind regards,
Henk de Jong
Click to expand...


Also, setting Input|Media to "Color Negative", changes the color
balance a lot. It's mentioned somewhere in the Vuescan help html.
 
Henk de Jong said:
It turns out that the "Color|Scanner color space" option affects
the raw image data when "Output|Raw output with" is set to
"Save". VueScan produces profiles that attempt to correct for
a non-linear CCD response, and the scanner profile can have
a gamma between 0.95 and 1.05. This non-linearity
correction is being done on the data before being written with
the scan.
Click to expand...

Yes, but if you use a built-in profile for your scanner, the
raw file is independant of the "Output|Raw output with" option.

As another person noted, the main thing that affects the
raw file is the "Input|Media" option - negative settings
expose the green and blue channels longer than positive
settings.

Regards,
Ed Hamrick
 
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