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One of the first scanning functions you are likely to perform after you set your General preferences is something called an Overview Scan or Prescan, in SilverFast that button is right here. When you click on this Overview or Preview button what happens is this scanner performs a low-resolution overview scan of the scan platen or the film holder if you are working with the dedicated film scanner, and this allows you to do several things. One, of course it allows you to locate the image to see where it actually where it is within the scan area, and then two, it allows you to set the scan frame and that's this red rectangle that you see here.
You don't always want to scan the entire image. If you just want to scan a portion of it you can set the scan frame by using a preview image and that'll determine what portion of the image will actually be scanned in final scan process. The other thing, this is preview image, of course it's very important for you, is doing image evaluation. Visually looking at the image or if you want to come in you want to set critical highlights and shadow points such as we see here that you can then monitor with your Info or Pipette palette that you see here. Now in some cases just having this small low-resolution overview scan like working with some simple line art is fine. That's all I need.
In other cases it's nice to be able to zoom in and this does have a Zoom tool, watch as I move my cursor up here in the upper left-hand corner and I click on Zoom you'll get some keyboard shortcuts that will come up and then I'll show you how to use your keyboard shortcuts for zooming in. But notice when I click on that with the default setting, if I want to enlarge then the preview scan has to be performed again. So that can be kind of time-consuming. One of the nice things about SilverFast is that there is an option that you can go to in the General tab and then click on Options down here.
We discussed this in Setting Preferences with a default to set on 1x for instance if we set our High resolution prescan at 4 times the normal amount and then click Apply and OK, then when we perform a prescan a little bit higher resolution is going to be used to perform that prescan. It takes just slightly longer. What this allows us to do is now when we go up to the button like this and we click on it or we use a keyboard shortcut to magnify, such as this, and I click on it, notice that I can keep magnifying without having to go through prescan.
In SilverFast as long as that little magnifying glass is green I can continue to keep enlarging. Once it gets red if I click again then it's going to perform a prescan. Notice one of the nice keyboard shortcuts you probably want to learn is if you hold down the Ctrl key it brings up the Magnifying Glass, then if you click the Option on a Mac, Alt on Windows see it says P, it will take you back to the original preview scan size and then you can zoom in again. You can also do the click- and-drag to zoom in as well. So as long as this is green you can continue to zoom in, and boom, go right back to the low view or the small dimension of the preview scan.
So there is setting up on performing a preview scan and controlling the preview scan resolution and how that can be helpful to you in configuring your image for setting up for the final scan.
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