digital images copyright 2006 south-western/thomson learning
TRANSCRIPT
Digital Images
Copyright 2006 South-Western/Thomson Learning
Screen 2
Image Resolution Measured in pixels per inch (PPI) for on-
screen images Measured in dots per inch (DPI) for print
images More dots mean higher resolution
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Screen 3
Resolution and File Size High-resolution images have large file sizes
compared to low-resolution images High-resolution images are good for printed
items Low-resolution images are usually okay for
displaying on screen Low-resolution images load quickly
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Screen 4
File Formats
BMP Used by Microsoft Windows and Office programs
JPEG Supports millions of colors and can be compressed
GIF Small and compressed images; popular for Internet
TIFF High-resolution format commonly used for print documents
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Screen 5
Scanners Capture images in formats such as TIFF,
JPEG, or GIF The capture process is called digitizing
Flatbed Scanner
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Screen 6
Digital Cameras Capture images electronically without film Resolution is measured in megapixels LCD screen shows image immediately Image quality settings
can be adjusted
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Screen 7
Moving Images to a PC Attach camera to PC with cable
Transfer images to PC Save images on a memory card
Attach card reader to PC and move images Use the Scanner and Camera Wizard to
copy images to PC
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Screen 8
Review
1. Which file format is commonly used for high-quality printed documents?
a. BMP
b. GIF
c. TIFF
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Screen 9
Review
1. Which file format is commonly used for high-quality printed documents?
TIFF
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Screen 10
Review
2. DPI (dots per inch) is used to express resolution for
a. On-screen images
b. Printed images
c. Images created with a digital camera and displayed in a slide show
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Screen 11
Review
2. DPI (dots per inch) is used to express resolution for
Printed images
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Screen 12
Review
3. High-resolution imagesa. Have large file sizes
b. Load quickly to the computer screen
c. Do not look good when printed
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Screen 13
Review
3. High-resolution imagesHave large file sizes
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Screen 14
Review
4. A digital cameraa. Captures images on film
b. Captures images electronically
c. Usually creates images in TIFF format
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Screen 15
Review
4. A digital cameraCaptures images electronically
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Screen 16
Review
5. When using a scannera. You can save captured images in
only one format
b. Images can be saved in grayscale but not in color
c. Images can be cropped to the desired size
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Screen 17
Review
5. When using a scanner
Images can be cropped to the desired size
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