Re: What Silverfast does when scanning using ICC profiles.
Re: What Silverfast does when scanning using ICC profiles.
- Subject: Re: What Silverfast does when scanning using ICC profiles.
- From: Andrew Rodney <email@hidden>
- Date: Fri, 22 Mar 2002 14:44:24 -0700
on 3/22/02 2:19 PM, John Vitollo at email@hidden wrote:
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Is Silverfast's method of using the input profile - as described above -
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desirable or is there a better method.
I'll leave that to the experts but a few days after I posted the information
from Paul, I got this from Lasersoft out of Europe:
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RGB and LAB-values
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SilverFast keeps all operations in RGB colour space. LAB is merely used as a
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reference colour space internally. LAB colour space has been intensely
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promoted by Linotype-Hell when they introduced LinoColor. As it turned out,
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LAB is not a good colour space to work with (except for a very few), that is
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why LAB never has been successfully been used in imaging software for
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corrections.
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As I had promoted and envisioned years back already, when I designed the
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concept of SilverFast HDR, 48 bit calibrated RGB has become the best platform
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for working with colour.
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SilverFast Unsharp Masking
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SilverFast is not converting all data to LAB in order to apply USM. Instead we
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have developed a system where we extract the lightness information ( the
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L-part of LAB) from the data to apply the USM to. This way we do not have to
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to disadvantageous conversions.
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SilverFast IT8 Calibration
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The purpose of IT8-calibration is to eliminate the colour- and brightness
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deviations of the input device. SilverFast has got 2 calibration modes. One
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native and one ICC-related. The native one is for those customers that have no
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ICC- compliant colour management. The second is creating an ICC-profile that
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integrated into the ICC-ColourSYNC or ICM workflow.
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Embedding Profiles
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It is not always necessary to embed profiles when passing on data to
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Photoshop. SilverFast with its linking into the Photoshop working colour
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space, can easily assure predictability of colour, which means what you see on
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the SilverFast preview, you will get in Photoshop. How is that assured?
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SilverFast is using the same ColorManagement system as Photoshop. You allocate
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an input profile (calibration), a working colour space profile (internal e.g.
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Adobe RGB(1998), make sure you have selected the same in Photoshop). You could
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then pass on data into Photoshop with perfect consistency.
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Embedding a calibration (input) profile only makes sense when you want to keep
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the original raw data fully uncorrected and do the input matching correction
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later. You can do that in SilverFast HDR which you can set up to recognize an
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embedded input matching profile and apply the matching on the fly.
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Matching Raw Data
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SilverFast Ai can scan / save into raw data with input matching applied to the
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raw data while SilverFast Ai / HDR can apply all corrections to the 48 bit
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output with or without matching.
Andrew Rodney
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