Transcript Digital Imagery Review Teacher Presentation

Digital Imagery Quiz – Review
Plank Jr. High – DIWD Class
Mr. Brown
Characteristics of a Digital Image
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It can be captured several1 ways:
– By camera
– By an image scanner
– By Cell phone
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Is stored on a Flash Drive, Memory Card, or
Computer as numerical data2 called Bits3
(i.e., 01010110)
 Memory Card and Flash are similar4
technologies known as “Solid State Storage”
 Is converted into the image5 by the camera
or computer
There are many6 types of Memory Cards
or Flash Drives
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San Disk Cards –
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Sony Cards –
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Fuji Cards -
[Photo Courtesy of: http://sandisk.com]
Memory Cards or Flash Drives
Are a rapid7 changing technology
 Come in various sizes8 and prices9
(e.g., 500mb, 1gb, 4gb, 128gb, etc.)
 Can only fit so many images10 before
they are FULL!
 Take a minute to look at one of the
major manufacturer web sites:
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http://sandisk.com/consumer-products
Importing Images from a
Memory Card to a Computer
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Most cameras come with a connector11
cable
Memory Card readers12 direct connect to
your computer and fit many types of
Memory Cards
Connections are via the USB Port13 on
your computer
Newer computers have built-in14 Memory
Card readers
A computer can fit only so many
images15 before it FILLS up!
Image Quality Key Terms
(see definition on Wikipedia for each)

Pixel - An abbreviation of the words “picture element16”. Is a
measurement of the resolution in a digital camera.
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Image Resolution – A measurement of the amount of
detail17 that can be recorded in a digital image. The higher the
number, the greater the image quality.
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DPI (Dots per inch18) – Is a measure of image density in terms
of the number of individual dots that are recorded in a 1 inch by
1 inch square dimension. Tends to correlate to an images
resolution
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MegaPixel - A megapixel is 1 million pixels19, and is a term
used to express the ability of a digital camera to take high
quality pictures.
An example of Pixel Density
This example shows an image with a portion greatly enlarged, in which
the individual pixels are rendered as little squares and can easily be seen.
Image Quality and Computer Storage
Most images are captured and stored
on a Memory Card or a Computer Hard
Drive in Kilobytes20
 KB21 – an abbreviation for Kilobytes
 The higher the quality setting22 used
on the camera, the larger the image23
and computer file size24 that will result
 The larger the image or file size, the
larger the Memory Card or Computer
Hard Disk Drive you will need
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Converting Kilobytes…
Know how to use the conversion
calculator found on this web site:
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http://www.calculatorfreeonline.com/converters/c
omputerstorage.php
Also know how to determine the
number of images that will fit on
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–
–
–
an 8 GB Memory Card
a 100 GB godaddy.com Web Hosting Plan
Convert Hard Drive size from Gigabytes to
Kilobytes, then divide by Image Size
Photo Capture Assignment Example
Image tags can be found by
“right-clicking25” on the picture
Image Computer File Formats
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JPEG26 – Is a compressed image format.
Very common on the Internet for its smaller
size and portability
Search wikipedia.org for
“Image File Formats27”
Adobe Photoshop
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Is used to compress28 images into JPEG format
• There are four29 main levels of JPEG compression
(Max, High, Med, and Low).
• When an image is compressed, it’s computer file size
is reduced, but it’s quality is not diminished
• Compressed JPEG images are the most common
images found on web sites
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Is used to change an image size30 (for example,
from 5x7” to Billboard size, etc.)
Is used to adjust image colors31, hue/saturation,
and balance
Is used to seamlessly blend32 two images
together into one
Has many other tools33 for creating graphic
designs
When to use High Quality vs. Low
Quality Images
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Use High Quality34 Images When:
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It’s a studio setting35 such as family picture
or art work
You want to blow an image up to larger sizes
(e.g., Billboard size, etc.)
Use Lower Quality36 Images When:
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You’re out having fun with friends or family
You’re publishing a Web site37 so your web
pages will load faster for visitors
To save space38 on your Memory Card,
Computer Hard Drive, godaddy.com Web
Hosting Plan