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Scanning Techniques for Photography, Art, and Design
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Performing a prescan


From:

Scanning Techniques for Photography, Art, and Design

with Taz Tally

Video: Performing a prescan

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.
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  1. 6m 48s
    1. Welcome
      1m 11s
    2. What you should know before watching this course
      3m 54s
    3. Using the exercise files
      1m 43s
  2. 1h 0m
    1. Scanners and digital cameras
      3m 6s
    2. Types of scanners
      5m 2s
    3. Scanner location
      3m 19s
    4. What scanners and digital cameras create
      7m 22s
    5. Understanding grayscale values and channels
      3m 19s
    6. Understanding pixels and vectors
      4m 1s
    7. Choosing pixels or vectors
      2m 27s
    8. Resolving resolution
      6m 32s
    9. Working with interpolation
      3m 31s
    10. Understanding the effects of compression
      2m 4s
    11. Evaluating and correcting images with histograms
      8m 26s
    12. Saving to different file formats
      7m 4s
    13. Color management
      4m 23s
  3. 33m 22s
    1. Cleaning your scanner
      7m 31s
    2. Cleaning your images
      7m 47s
    3. Calibrating your scanner
      9m 13s
    4. Creating and applying a color management profile
      8m 51s
  4. 20m 55s
    1. Evaluating your scan challenges
      9m 46s
    2. Reproducing vs. assigning colors
      6m 20s
    3. Recognizing continuous tone (contone) vs. dot pattern images
      4m 49s
  5. 36m 32s
    1. Understanding bit depth
      8m 49s
    2. Selecting a scan mode
      8m 20s
    3. Sharpening and its effects
      10m 40s
    4. Creating and assigning color management profiles
      8m 43s
  6. 2h 25m
    1. Taking the Tazmanian Oath!
      3m 38s
    2. Choosing your weapon
      4m 2s
    3. Setting up your scanning preferences
      12m 14s
    4. Performing a prescan
      2m 53s
    5. Assigning a scan frame
      5m 40s
    6. Determining scan resolution
      7m 57s
    7. Choosing a scan mode and bit depth
      5m 53s
    8. Naming images
      1m 49s
    9. Scanning simple logos and line art
      12m 21s
    10. Scanning complex line art
      7m 33s
    11. Scanning grayscale contones
      13m 22s
    12. Scanning color contones
      13m 54s
    13. Sharpening
      9m 39s
    14. Scanning printed/screened or patterned images
      7m 1s
    15. Scanning positive transparency film
      12m 33s
    16. Scanning negative transparency film
      9m 11s
    17. Capturing high dynamic range (HDR) scans
      1m 47s
    18. Setting up wet scans
      14m 29s
  7. 1h 48m
    1. Scanning, converting, and using simple line art
      5m 32s
    2. Scanning and using detailed line art
      10m 52s
    3. Scanning landscapes
      15m 50s
    4. Scanning product shots
      11m 58s
    5. Scanning combo/complex images
      9m 3s
    6. Adjusting distressed images
      11m 12s
    7. Scanning images with no neutrals
      11m 57s
    8. Post-scan touch-ups
      2m 7s
    9. Scanning images for multiple uses
      10m 44s
    10. Automatic scanning
      10m 40s
    11. Streamlining big jobs with batch scanning
      5m 22s
    12. Using your manufacturer's scanning software
      3m 14s
  8. 27s
    1. Goodbye
      27s

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Scanning Techniques for Photography, Art, and Design
6h 53m Intermediate Oct 11, 2011

Viewers: in countries Watching now:

Review the scanning techniques graphics professionals and photographers use, while delving into workflow considerations and the advanced image-quality controls available in most scanning software. Author Taz Tally explains the core concepts, such as how resolution and interpolation affect scans; introduces the industry-standard SilverFast scanning software; and shares the settings to achieve the best results from a scan. The course also covers keeping your scanner and its parts clean and free of dust, and includes a variety of start-to-finish scanning tasks.

Topics include:
  • Understanding grayscale values and channels
  • Evaluating and correcting images with histograms
  • Saving to different file formats
  • Managing color
  • Cleaning the scanner and images
  • Reproducing versus assigning colors
  • Recognizing contone versus dot pattern images
  • Understanding bit depth
  • Scanning logos and line art
  • Scanning transparent film, positive or negative
  • Capturing high dynamic range (HDR) scans
Subjects:
Design Photography Scanning
Author:
Taz Tally

Performing a prescan

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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