graphics ms. brewer spring 2013. bellwork edmodo – log on! quiz? take it if you need to! policies...
TRANSCRIPT
Bellwork
• Edmodo – log on!• Quiz? Take it if you need to!
• Policies and Procedures Powerpoint in Shared Folder!
• Get to Know you document in Shared Folder!
• What does it mean to compress an image?
• Why do you think we compress images?• What do you think are the effects on
the image?
BELLWORK
Topics we’ll be Exploring…
• Graphic File Formats• Clipart• Photo Editing• Photo Manipulating• Creating and Presenting Graphics Projects• Multimedia Projects
Assignments you’ll have…
• Vocabulary Quizzes• Original Clipart• Clipart Projects• Paint Projects• Photo Editing and Manipulation • Multimedia Projects• Individual Presentations
Top ways to ACE Graphics
Complete all assignments according to the rubric.
Hand your work in on time.Complete your powerpoint
presentation when I am giving notes or explaining something new – they are graded.
Study for your tests and quizzes. They do count!
Top ways to ACE Graphics
Plan ideas in advance. Storyboards are graded.
Have a positive attitude and good work ethic
Be Creative
Be School Appropriate
Be Unique
So why do we compress images??
• By decreasing the image size (bytes) the screen speed is faster
• By decreasing the image size (bytes) the web page loads faster
• By decreasing the image size (bytes) the less the bandwidth consumption
Lossless Compression
• The file does not discard any data when saving.
• Compression occurs by recording color changes from the pixel directly to the left.
• Each pixel maintains its own identity.
• Compression results in a sharp image that looks identical to the original.
• Can reduce a file up to 30%.
Lossy Compression
• The file loses data each time it is saved.
• Compression occurs by averaging pixels values (colors) to eliminate the amount of info needed to be saved.
• Each time you save, your image deteriorates more resulting in COMPRESSION ARTIFACTS.
• Can reduce a file up to 50%.
Compression TypesLossy
A compression type in which the image loses color data each time it is saved.
How it compresses:Averages colors so some
can be eliminated.
Compression results:Loss of quality, blurring
and compression artifacts.
Percent of reduction:
About 50%
Lossless
A compression type in which no data is lost when saving.
How it compresses:Compares each pixel with the
one before it and only records color change.
Compression results:No color loss or blurring.
Percent of reduction:
About 30%
Bellwork
Use the Internet to find the full file format names for the following file extensions:
.gif
.tiff
.jpg or jpeg
.png
.psd
.bmp
.gif Graphics Interchange Format
• Characteristics– Can only have 256 colors
• Compression–Lossless Compression
• Best Uses–Web Graphics (logos, banners)–Text, Line Art, Large blocks of Color
• Poor Uses–Photographs
.bmp Bitmap
• Characteristics– Older File Format–Created by Microsoft – use with MS Paint
• Compression– Lossless Compression if done through ZIP
• Best Uses–Clipart and Basic Images
• Poor Uses– If need a quick response time
.png Portable Network Graphic
• Characteristics– Newer File Format to replace .gif–Standard File Format for Paint
• Compression–Lossless Compression
• Best Uses–Web Design Image Format
• Poor Uses–Traditional Print
.jpeg Joint Photographic Experts Group
• Characteristics– Uses all Colors (16.7 Million)–Recognized by all Web Browser Software
• Compression– Lossy Compression
• Best Uses–Photographs–Screen Graphics – Power Point, Web
• Poor Uses– Images with few colors, text, simple shapes
.psd – Photoshop Format
• Characteristics– Uses all Colors (16.7 Million)–Supports Photoshop Functions
• Compression–Lossless Compression
• Best Uses–Photoshop Work in Progress
• Poor Uses–MS Office Programs or Web Site images
.tiff Tagged Image File format
• Characteristics– Can use any resolution–Supports Photoshop Functions
• Compression–Lossless Compression
• Best Uses–Print Graphics
• Poor Uses–Web Images