SilverFast Clarification Needed: Impact of Custom Settings on Auto IT8 Calibration Accuracy
Verfasst: Donnerstag 8. Februar 2024, 07:28
Hey all, I've been using FilmScanner.info for a long time. The site has been a goldmine of information for scanning. I have one question that still persists and perhaps one of you can help.
I am using the following for only scanning of reflective materials:
Hardware: Epson v850 Flatbed Scanner
OS: Windows 11 64-bit
Software: SilverFast Ai Studio 9 Archive Suite + (HDR Studio)
IT8 Target: LaserSoft's 'Advanced' Reflective Color Target that follows ISO 12641-2 (Part 2)
Scanning at:
48-Bit HDR RAW
2400 DPI
TIFF (RAW/Linear Output file)
SilverFast support has been slow to help, and can sometimes be quite vague and not helpful to explain the 'why?' behind more technical questions.
Regarding their Auto IT8 Target Calibration, they have informed me:
SilverFast Support:
Me: I understand that scanner profiling should match the settings used for subsequent scanning tasks. However, I've noticed that SilverFast resets to default settings (e.g., from my set values of 48-bit HDR RAW to 48 -> 24-bit, and from 2400DPI to 300DPI) when initiating the Auto IT8 calibration.
My remaining questions are:
1. If I revert the settings (Color Depth and DPI) to my preferred values (48-bit HDR RAW and 2400DPI) before the calibration begins - but after I click the Auto Calibrate button - will this affect the accuracy of the generated ICC profile?
2. Is the adjustment to 24-bit and 300DPI a compulsory step for the Auto IT8 calibration, or can I maintain my desired settings (48-bit HDR RAW and 2400DPI) throughout the calibration process without compromising its effectiveness for generating a proper and accurate ICC profile?
3. Also, I understand that HDR RAW files will be very dark. However, when opening in Photoshop, the histogram shows the shadows pushed to the extreme left, a lot of clipping.
Does anyone here know the answer to this?
PS. Once I create a proper ICC profile from the Auto IT8 Calibration, I will begin creating RAW scans of archival materials.
Workflow: SilverFast > Scan at 48-Bit HDR RAW, 2400 DPI, TIFF > Save > Open TIFF in Photoshop, apply ICC Profile > Save > Open COPY of that same file in Photoshop > Secondary Processing for Derivative Files for color adjustments, leveling, downsampling to 24-bit, etc.
But I am urgently requesting clarification on impact of custom settings during Auto IT8 Calibration, thanks!
I am using the following for only scanning of reflective materials:
Hardware: Epson v850 Flatbed Scanner
OS: Windows 11 64-bit
Software: SilverFast Ai Studio 9 Archive Suite + (HDR Studio)
IT8 Target: LaserSoft's 'Advanced' Reflective Color Target that follows ISO 12641-2 (Part 2)
Scanning at:
48-Bit HDR RAW
2400 DPI
TIFF (RAW/Linear Output file)
SilverFast support has been slow to help, and can sometimes be quite vague and not helpful to explain the 'why?' behind more technical questions.
Regarding their Auto IT8 Target Calibration, they have informed me:
SilverFast Support:
"During calibration, SilverFast will automatically set the software to neutral values for the process.
You do not need to care about settings in the software for it."
Me: I understand that scanner profiling should match the settings used for subsequent scanning tasks. However, I've noticed that SilverFast resets to default settings (e.g., from my set values of 48-bit HDR RAW to 48 -> 24-bit, and from 2400DPI to 300DPI) when initiating the Auto IT8 calibration.
My remaining questions are:
1. If I revert the settings (Color Depth and DPI) to my preferred values (48-bit HDR RAW and 2400DPI) before the calibration begins - but after I click the Auto Calibrate button - will this affect the accuracy of the generated ICC profile?
2. Is the adjustment to 24-bit and 300DPI a compulsory step for the Auto IT8 calibration, or can I maintain my desired settings (48-bit HDR RAW and 2400DPI) throughout the calibration process without compromising its effectiveness for generating a proper and accurate ICC profile?
3. Also, I understand that HDR RAW files will be very dark. However, when opening in Photoshop, the histogram shows the shadows pushed to the extreme left, a lot of clipping.
Does anyone here know the answer to this?
PS. Once I create a proper ICC profile from the Auto IT8 Calibration, I will begin creating RAW scans of archival materials.
Workflow: SilverFast > Scan at 48-Bit HDR RAW, 2400 DPI, TIFF > Save > Open TIFF in Photoshop, apply ICC Profile > Save > Open COPY of that same file in Photoshop > Secondary Processing for Derivative Files for color adjustments, leveling, downsampling to 24-bit, etc.
But I am urgently requesting clarification on impact of custom settings during Auto IT8 Calibration, thanks!