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Thread: How big are files when scanned?

  1. #1
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    Default How big are files when scanned?

    I need to get an idea about how much storage I will need, so I need to know how big file sizes might be for the following 4 scanning options. The sheets would be a typical line drawing

    D size, 300 dpi, black and white & color

    D size, 600 dpi, black and white & color

  2. #2
    The Silent Type Mike.Perry's Avatar
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    Question Re: How big are files when scanned?

    Hi

    What format are you planning to save in?

    The chosen format can greatly affect file size.

    Have a good one, Mike

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    Default Re: How big are files when scanned?

    I would be saving in a tiff file format only becasue I don't know a lot about the jpeg files. I know that jpegs con be compressed down quite a bit, but how does that affect overall quality.

    A salesman also mentioned saving in a pdf format but I think that would be the same as a jpeg. If anybody has any info on image files let me know.

    Thanks

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    Default Re: How big are files when scanned?

    I used to have a OCE 9600 with scanner.
    We scanned the files at 200dpi so that a 24x36 was around 4.2Mbs, thereabouts.
    Seem standard regardless of how much info was on the sheet.
    We plotted these scans against regular plots and there seem to be negligible differences. Hardly noticeable.
    300dpi increased the file sizes too much, so we decided against it. Otherwise you end up running out of server space and have to upgrade your capacity way too often.
    The TDS plotted at 400dpi native anyway.
    Converting to PDF drops the file size considerably ( I think about half ) but not as much as DWF.
    You can convert the tiffs directly to PDF in acrobat. (PDF compresses your file and optimizes your dpi so it doesn't matter if you scan at 200, 300 or 600dpi.)

    Hope this helps.

  5. #5
    The Silent Type Mike.Perry's Avatar
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    Default Re: How big are files when scanned?

    Hi

    scan dpi jpeg tiff

    Have a good one, Mike

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    AUGI Addict Glenn Pope's Avatar
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    Default Re: How big are files when scanned?

    Tiff is usually the format of choice. We use that at my current job. Jpeg will be a lot smaller in size, but you will notice the compression. You might look into PNG format. They have a very good compression, usually better then jpeg, plus look just as good as tiff images. PNG is supported my standard AutoCAD 2000 or higher.

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    Digital Delivery Director Brian Myers's Avatar
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    Default Re: How big are files when scanned?

    Quote Originally Posted by boesiii
    I need to get an idea about how much storage I will need, so I need to know how big file sizes might be for the following 4 scanning options. The sheets would be a typical line drawing

    D size, 300 dpi, black and white & color

    D size, 600 dpi, black and white & color
    D size, 600 dpi? Are we talking photo's? I can't think of any reason to ever need a resolution this high for line drawings. I work for a company that prints "blueprints" from TIF's daily, our scans are no more than 300 dpi (often 200) and they look very, very good.... Size can range from 2mb to 12 mb... typically 4mb is about average....
    Last edited by Brian Myers; 2005-10-12 at 03:25 AM.

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    Certified AUGI Addict jaberwok's Avatar
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    Default Re: How big are files when scanned?

    For technical line drawings 200 dpi is generally good enough. You can see the difference at 300 dpi if you are looking to see the difference. You might see a difference at 400 dpi (using a magnifying glass). Anything over 400 dpi is, IMHO, pointless.

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