Theme: Options button
Q:

How can I understand the function "high resolution prescan"?

A:

this function allows to determine how much information the SilverFast prescan shall contain. Having more than the normal screen resolution information in the prescan allows for immediate presentation of a prescan-zoom (no need for refresh scan on zoom). The more information the initial prescan contains, the more details are in the zoomed preview.


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Q:

The auto-adjust function only corrects the first slide of a batch scan with my film scanner. What is wrong?

A:

The 'automatic when ADF' box must be ticked in the "options" dialog window.
The "automatic when ADF" checkbox means that when scanning multiple slides the "auto-correction" function will be carried out on every single scan of a given batch. On the other hand, the "auto-adjust" indication that comes up at the first scan of a batch, is automatically adjusting the light-exposure intensity. This is something that needs to be done once when the Nikon scanner "gets into gear" SilverFast has nothing to do with the "auto-adjusment".


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Q:

Is the Autopip Middlefactor a preset helping the "auto-correction Icon" button (or the [Auto] button in the Histogram Dialogue) to set the midtones?

A:

Correct! the auto pip tells the function behind the Auto button how high resp. how low it can go! (to set the midtone correction - centre point on the curve in curve gradation, which corresponds to the middle triangle in the histogram)


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Q:

Does changing the Autopip middle-factor's sliders change the 50% pre-determination?

A:

The default is set to a curve bending of -30 for upward and 30 for downward bending. The function behind the auto button tries to determine where in the histogram it should determine 50%, where 50% is an equal no. of pixels for dark and bright areas. So 50% is measured according to the scale in the histogram (the higher the bars the more pixels are seen by the scanner) for example if you have a histogram with very low bars near the highlight point and very high bars near the shadow point the middle triangle won't sit in the middle of the histogram but near the shadow end, as the amount of pixels is higher on that end and thus you have an equal no. of pixels on either side of the middle triangle. In other words you cannot set 50%, but you can tell the Auto button how strong it should auto-correct an image.


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Q:

How does the automatic threshold highlights resp. shadows affect the way SilverFast works?

A:

Options button > Auto > "Auto Threshold highl. resp. shadows # level" when auto-correcting an image usually the whole range of greyscale values 0 to 255 (rsp. 0% to 100% CMY).
A threshold value of 30 (for both boxes) for example means that SilverFast's auto correction function should skip 30 pixel values counted from the extreme highlight AND shadow value read in the histogram; letting the little triangles in the histogram dialog of SilverFast moving 30 steps further into the histogram of a given image and consider those values as absolute black or white point for this image.

The checkbox "level" here means "RGB level" (or CMY respectively). When the "level"-box is checked the factors "Auto threshhold highlight / shadow" are treated as real RGB steps (rsp. CMY) and not as relative factors that correspond to the total quantity of pixels.


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Q:

Under which conditions should I alter the "auto threshold function" values?

A:

The auto threshold values should be altered on images with flat bright or very dark backgrounds.
For example scanning text on coloured background is a task where the auto threshold function can help.


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Q:

How can I interpret the value box for "color cast removal" here?

A:

0% = no color cast removal, 100% = full color cast removal. Whether the color cast is active or not is also visible in the SilverFast histogramm.


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Q:

What does SilverFastâÃÃs âÃÃAuto Frame Inset" do?

A:

This is a virtual downscaling - or offset - of the scan frame which will apply on the image auto correction algorithms only. The amount of downscaling can be set by user (value in percent towards the centre of scan frame). This means if you set that value to 10%, SilverFast auto correction and SilverFastâÃÃs automatic negative correction will take into consideration the image data inside the scan frame less an offset of 10%.


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Q:

What is the field "Mid pip fixed target" in SilverFast > Option > Auto good for?

A:

Options button > Auto > "Mid pip fixed target checked active This function is for determine the neutral value (in %) for the middle pipette. This function is only live when the "active"-box is checked.
What does it do?
You can enter a value (%) for determining neutral luminance value (for example 50%) then the neutral luminances (grey) of the pixels of a given image will be 50% grey.

Where in my image will these neutral value be?
You can determine by yourself. If a value is given, the "active"-box is checked, and that "Presets" dialog is closed with "Ok", you select the middle pipette (highl./middle/shadow button, left of Expert button) and move the curser over the preview (the curser is a grey pipette now). Where you click that luminance value will be set to the value you entered in "mid pip fix".


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Q:

When I want to set a CMYK separation table (in CMS dialog, last field) I have some odd choices in that combo box. Isn't SilverFast compatible to PS7?

A:

These false entries in that combo box "Plug&Play CMYK" are due to a restructured Photoshop. This problem is fixed in SilverFast release versions 5.5.2r17.


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Q:

CMS: I want to set the "scanner - internal" option to "calibration" but this option is disabled. Why?

A:

The option "calibration" stands for the IT8 calibration profile that was generated with SilverFast's IT8 calibration function.
When this option is inactive (grey) this means that no IT8 calibration profile is stored in the SilverFast program folder.
So either no calibration was made or
the IT8 calibration function is not live in your SilverFast or
your SilverFast is set to "negative scanning", the IT8 calibration function is NOT available for negative scans.


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Q:

CMS: What is the best setting for "Internal - Monitor"?

A:

Here you may select the mode how your host application (where the scan finally goes to) should display that image.
- "none" = no syncronization
- "ColorSync" (ICM on Windows) = use the ICC profile I set under "internal"
- "automatic" = the internal color space used by the host program should be used for this image, too. In this case you must specify under "Internal" what color space is used.


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Q:

CMS: What is the optimum choice for the selection box "internal"?

A:

In this selection box you can set a ColorSync profile (ICM under Windows) as the internal colour space to be used when displaying this image. You have to make sure the image processing application will use the same profile as its internal colour space.


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Q:

In SilverFast > Options > Special what do I need the selection box "color filter" for?

A:

With this box you select the colour, which you wish the scanner to ignore during monochrome scans. Where the option "white" means no colour is ignored. Selecting a colour here means that the different intensities of this colour will all set to just one value. Details in this colour channel are compensated.


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Q:

What function is behind the "limit gamma slope" checkbox?

A:

this checkbox is yet another way to limit thermal noise of the hardware. The function behind this checkbox will slightly distort the ascending of the gamma curve just enough to prevent the lighter pixels of dark areas to be brightened too much, and will then return to the normal ascending slope of the gamma curve. The result is that the slightly brighter pixel values of dark areas will not be enforced and thus appear as noise.

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