Digital Photos and Scanning

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Digital Photosand Scanning

• One, Zeroes, Pixels

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Digital Photos Scanning

• Binary Data
• Bits Bytes
• Raster vs. Vector
• Common File Formats
• Traditional Photography

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Binary Data

• Computers use ones zeroes (on/off yes/no)
• It plays 20 questions
• Digital Photos are created by Pixels
• Light turned into Pixels by CCDs.

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Bits Bytes

• 1 bit (1 or 0 / B or W)
• 8 bits 1 Byte
• 1000 bytes 1 Kilobyte
• 1000 KB 1 Megabyte
• 1000 MB 1 Gigabyte

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Bits Bytes

• 1.4 MB (Floppy Disk)
• 100/250 MB (Zip Disk)
• 650/700 MB (CD-ROM)
• 1 GB flash drive
• 4.7 GB (DVD-ROM)

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Raster vs. Vector

• Rasters use pixels
• Aka bitmaps
• E.g. digital photos
• Finite resolution
• Vectors use geometry
• Aka draw-type
• E.g. drawings
• Infinite Resolution

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Raster vs. Vector
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File Formats

• GIF (8 bit)
• 256 colors
• Lossless compression
• Artwork with few colors
• JPG (24 bit)
• 16.7 million colors
• Lossy compression
• Photos

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File Formats

• PNG (8 or 24 bit)
• 256 or millions of colors
• Lossless compression
• Artwork or photos
• TIFF (8 or 24 bit)
• 256 or millions of colors
• Usually no compression
• Artwork or photos

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File Formats

• PSD (up to 32 bit)
• Photoshops native format
• Any bit depth
• No compression
• Supports layers
• Supports alpha channels

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Traditional Photography
SLR Characteristics
Single Lens Reflex
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Traditional Photography
Through-the-Lens Viewing
Single Lens Reflex
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Traditional Photography
Focal Plane Shutter
Single Lens Reflex
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Traditional Photography
Interchangeable Lenses
Single Lens Reflex
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35mm Lenses

• Normal 50mm
• Wide Angle lt 50mm
• Telephoto gt 50mm
• Macro

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Exposure

• Film Speed (sensitivity)
• Shutter Speed (e.g. 1/60 sec.)
• F-Stop (e.g. F11)

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Digital Photos Scanning

• Binary Data
• Bits Bytes
• Raster vs. Vector
• Common File Formats
• Traditional Photography

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