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Thread: Simplified Scan Guide by Silver Sea

  1. #1
    Translator 上級員 / Jyoukuuin / Sr. Member Silver_Sea's Avatar
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    Simplified Scan Guide by Silver Sea

    This guide is a simplified version of Ookla's scan guide. The only difference is that two pages are scanned at once, rather than one.
    Spoiler show

    CALIBRATING THE SCANNER
    What's that?
    Practically speaking, it means leveling the RAW as you scan so that the whites are white and the blacks are black from the moment the image is scanned. What you see on the screen matches the printed page perfectly, producing the "perfect scan". No further leveling needs to be done by the cleaner.

    How is this done?
    By choosing the optimum shadow, highlight and gamma values from the scanner's TWAIN software. (i.e. ScanGear in a canon scanner.) Its important to remove the book from the scanner and compare what's on the screen to what's on the book.

    Why is this important?
    Because only the scanner has access to the original magazine image. The editor might level the image incorrectly as s/he has no idea how the original looked.
    Quote Quote:
    PROCESS
    Choose Test Page> Photoshop > File > Import > TWAIN ( eg ScanGear)> Preview > adjust gamma>adjust histogram > record down your gamma, black-point and white-point value> Scan.
    Repeat until you get the perfect scan > Save your gamma and histogram settings.

    Gamma = Adjust Brightness
    Histogram = Leveling.

    You only need to tweak the "gamma" and "histogram" settings...or even just either gamma or histo when you become an expert.
    LET'S START!
    1. Choose a test page with good amount of Black, White and Greytones. Place your debinded tankobon two pages at a time flat against the scan bed.( see appendix for details)

    2. Open Photoshop and go file > import > (your scanner name)
    eg: file > import > canoscan Lide80

    3. The scanning software opens: in this example, it is "ScanGear CS".

    4. Do an "Auto" scan @ Greyscale / 600dpi (or 300dpi) / Full Platen. Remove the book from the scanner and compare it with what you see on screen. The results should convince you to manually calibrate your scanner.

    5. Always use the "advanced mode". Disable all auto functions as a rule because they were meant for photos, not manga.

    Quote Quote:
    6. The first test:
    Main :Select Greyscale / 600dpi (or 300dpi) / Full Platen.
    Settings: Uncheck everything. Look for the "Preferences" button. Press it, and disable all auto functions that you see on the new page.
    Color:
    1. Brightness and Contrast
    2. Gamma
    3. Histogram
    4. Special Tone Curves
    Only the Gamma and Histogram need to be tweaked in manga scanning.
    CALIBRATING = TESTING THE GAMMA/BLACK-POINT/WHITE-POINT
    __ScanGear
    Spoiler show

    ADJUSTING THE GAMMA:

    Spoiler show

    Practically speaking, a 1.0 Gamma reading means a brightness level perceived by the scanner as 1:1 to the printed page. 1.2 gamma means more white pixels in the scanned image. 0.8 gamma means more black pixels. Most of the time, I use Gamma between 1.2 - 2.0
    Spoiler show

    ADJUSTING THE HISTOGRAM

    Spoiler show

    This is exactly the same as leveling. If you are good at levelling, you'd be good at scanning. You can observe the changes in the preview and its pretty good, but always remove the book after scanning to compare what's on screen to whats on the page.
    Spoiler show


    RECORD YOUR VALUES:
    Gamma=?
    Black-point=?
    White-point=?

    Repeat with a few values, getting closer and closer to the perfect scan each time.

    SUCCESS!
    Record down your values and save it. You can reload it next time you scan manga. =)

    SAVING AS "IMAGE ADJUSTMENT VALUES" (.adc)
    When you finally get the calibration values for your scanner, you can save it in a file as an .adc. Be descriptive in your naming conventions or it will bite you hard in the butt!
    __"save as .adc

    FINAL ADJUSTMENTS:
    1. Clean your scanner glass approx. after each chapter because of dust.
    2. After scanning the chapter or the whole volume, not all pages will end up perfectly levelled. Fix that with the use of curves or levels.
    3. Save as .png-8 adaptive dithered for greyscale images, .jpg for colored images.
    4. Use a .png optimizer now if you know how to.
    5. Zip it up and upload for your editor!

    Congrats on becoming a pro scanner for B&W lineart.Next challenge...color images.

    Appendix 1:
    DEBINDING
    __unhinging__cutting__fail

    1. Start by nudging the cover as far as it can hinge. By doing it slowly, you can achieve good results. I've heard of alternative methods of using a microwave or ironing the book. Sounds good, but I've not found that necessary, yet.

    2. After you do hinge open page 1, follow with pg 2, pg 3 and so on, nudging the seam open as widely as the glue permits.

    3.Once you reach the end of a chapter, take out your small penknife and prepare to cut. [ It's up to you how much you want to cut, but the less you cut, the darker your gutter shadow may be...and the more time you waste cleaning it later.]

    4. BE VERY VERY SLOW when you slice the book down its spine. A mistake means damaging the whole chapter. Like my fail cut...

    Appendix 2:
    PREPARING THE SCAN BED

    __a: paper guide__b:unflattened
    __c:flattening the spine__d:books on both leaves

    1. A guide is useful for keeping the edges straight. You can't press the books flush against the edge of the scan bed because the initial 3mm around the corners do not get scanned. Thick Paper/card/plastic work fine.

    2. You can cut out your space for your tankbon anywhere within the full platen, but allow space for the placement of books. [ We will be scanning full platen. Scanning the minimum size B5 is only 2 secs faster, and pushes the books awkwardly to the side].

    3. Do not use hands to flatten the spine, use books instead, esp dictionaries. =D That's because the scanner can pick up the uneven pressure of hands as shadowy patches, XD.

    Appendix 3:
    3 DIFFERENT TONE PROFILES
    __Profile 1 __Profile 2 __Profile 3

    IMO, there are 3 different kinds of manga profiles to accomodate
    Profile 1: Black and Whites, no tones => more leveling needed.
    Profile 2: Dark tones dominate =>watch out against overly dark scans. Grey flag may have to be shifted to the left to lighten the greys.
    Profile 3: Light tones dominate =>watch out against overly light greys, especially in fabrics.

    What does this mean?
    One calibrated value does not fit all chapters perfectly. Different series will also have their own specific calibration profile. In practice, I use Profile 3 most often because it can capture all the tones and then I re-level/ use curves as necessary.

    Feedback welcome if you have beta-tested this tute.
    Last edited by Silver_Sea; November 07, 2007 at 05:00 PM.

  2. #2
    Scanlator 英雄メンバー / Eiyuu Menbaa / Hero Member Crayola's Avatar
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    Re: Simplified Scan Guide by Silver Sea

    Thanks a lot for the guide, When i get a scanner, I'll porbalby use this technique since it seems a lot simpler then all the other guides "ve read
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  3. #3
    Queen of The Damned MH中毒 / MH Chuudoku / MH Addicted Nami's Avatar
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    Re: Simplified Scan Guide by Silver Sea

    This is a very useful guide - easy to understand too. Never know it's a complicated process behind raws. Thanks Silver Sea!




    ▲Away till end June. ▲

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  4. #4
    Scanlator 上級員 / Jyoukuuin / Sr. Member Jinoh's Avatar
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    Re: Simplified Scan Guide by Silver Sea

    I'll plan on using it sometime, I'll be sure to post feedback.

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