3_1_scanners

3_1_scanners - Introduction to digital imaging IMAGE...

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Introduction to digital imaging IMAGE ACQUISITION: SCANNING
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IMAGE ACQUISITION Types of scanners (review) Scanner settings Scanning images – Line art – Grayscale – Color Scanning issues
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IDENTIFYING THE ORIGINAL The source for your image will determine the digital capture method* Originals can come from different sources which may need to be converted to digital format – Conventional photograph – Flat art – Video capture – Screen capture – Digital photo of scene/subject* – Existing digital image file* *already digital
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IDENTIFYING THE ORIGINAL Conventional photographs* – Film • 35mm negatives, 4x5 and large format negatives, slide positives • Original film needs to be scanned – Prints • Standard sizes (4x6, 5x7, 8x10, etc…) can be scanned – Large format prints can be photographed with a scanning back camera
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SCANNERS Scanners
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SCANNERS Scanner* – Device that optically scans an image or document through the use of a linear array electronic sensor and creates a digital file – Types of scanners • Drum • Flatbed • Film
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SCANNERS Drum scanner* – Produce high quality scans from transparencies or prints (transmissive and reflective) – Originals mounted on a rotating acrylic drum scanned through a photo-multiplier tube – Used for images to be enlarged, archiving, or high-end publishing – Very high resolution- up to 12,000 ppi, optical – High dynamic range- close to 3.9 – Up to 64-bit depth – Very expensive
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SCANNERS Flatbed scanner* – Produce high quality scans from prints (reflective)
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3_1_scanners - Introduction to digital imaging IMAGE...

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