Graphics

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Graphics Images Scanning Digital Cameras
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File Types -- Graphics

• JPG -- use for quality photos, larger file size
• GIF -- use for line drawings, smaller file size
  than jpg but poorer resolution
• PNG - emerging file type, like a jpg but has
  smaller file size

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Program Types -- Graphics

• Paint
• Draw

How was the picture created? Can you modify it?
(size, colors)
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Paint Programs

• Bit-mapped images
• Pictures are a series of dots (pixels)
• You can get very detailed pictures this way
• When you modify these pictures, you do it via the
  pixels rather than as a whole
• You can tell you have a draw picture from the net
  when you cant resize it using the handles.

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Draw Programs

• Object-oriented images
• Pictures are geometric figures (lines, circles..)
• You can get very detailed pictures this way
• When you modify these pictures, you do it as a
  whole (grouped) or by each component
• You can tell you have a draw picture from the net
  when you CAN resize it using the handles.

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Terminology

• Resolution - How crisp and clear is your picture?
• Pixel - The images we see on a screen or paper
  are generally made up of dots (aka Pixels).
• Dots Per Inch (DPI) - How many dots are there in
  one inch?

Web size gif 92k
25 dpi 44k
72 dpi 72k
300 dpi 128k
9 dpi 40 k
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What Resolution to Use?

• Line copy - Printed
• Scan at 300 dpi with a pixel depth of 1
• Line Copy - Screen
• Scan at 75 dpi with a pixel depth of 1
• The higher the resolution, the larger the file
  size

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72 dpi -- Illustration - 120 k
300 dpi -- Illustration - 484 k
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.gif 152k 72 resolution
http//humor.about.com/gi/dynamic/offsite.htm?site
http//www.ucomics.com/calvinandhobbes/viewch.cfm
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Image Reproduction

• Think about how you are going to use your image.
• Web (72 resolution)
• PowerPoint
• iMovie (640x480 pixels, 72 resolution)
• Original from printer (ink jet, laser, color,
  BW)
• Duplicate from printer copy
• Black White
• Color

See images on wall
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Before we go use the scanner, lets think about
digital cameras first.
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Digital Cameras

• What are you going to take pictures of?
• Who is going to take pictures?
• How are pictures going to be used?
• How are pictures stored/saved in camera?
• Price vs Pixels
• 2.5 mega pixels minimum
• Get a tripod to eliminate wiggles

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Not all cheap cameras are bad -- JamCam 208k
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Much better camera - Sony - 148 k
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HERITAGE ORCHARD
(150k x 6) 900 k 1 M
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Scanning Images

• Photoshop Elements (NE 202 or 213)
• Put graphic in scanner
• File, Import, Epson Twain 5, graphic is
  prescanned
• Select portion of graphic to scan
• Select image type, destination, resolution
• Source will tell you how large your picture will
  be, can change this.
• After scan, Image - crop, resize File - save
• You can modify image in Photoshop or other
  similar programs.
• Note to scan text to use as text, use TextBridge
  in NE 213

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To Do.

• Scan something or several things (perhaps to put
  on your webpage or in your ppt or iMovie)
• Take a digital picture or two or a dozen (perhaps
  to put on your webpage or in your ppt or iMovie)
• Think about how you might use images in your
  classroom
• Copy and save this show for later reference.