Pixels resolution and file types
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Pixels, Resolution and File Types PowerPoint PPT Presentation


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Pixels, Resolution and File Types. Using Digital Media in the Classroom. START. What is a Pixel. Two graphic types: Raster or Vector We will only be working with Raster images Raster or bitmap images are made up of pixels A pixel can be thought of as a dot of color

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Pixels resolution and file types

Pixels, Resolution and File Types

Using Digital Media in the Classroom

START


What is a pixel

What is a Pixel

  • Two graphic types: Raster or Vector

  • We will only be working with Raster images

  • Raster or bitmap images are made up of pixels

    • A pixel can be thought of as a dot of color

      • The smallest part of an image that can be displayed

  • Picture size of 640X480

    • 640 pixels wide by 480 pixels deep

    • 307,200 pixels make up the picture

      Pixel Example

640

480


Screen resolution

Screen Resolution

  • Monitor screens display pixels

  • Depending on the size of the monitor they will display between 72 and 96 pixels per inch

  • Most common resolution 800 pixels X 600 pixels

  • Can view at most a picture that is 800 pixels wide by 600 pixels deep

  • Anything larger will have to be cut down to be viewed on the screen


Printing resolution

Printing Resolution

  • Printers print pixels

  • Rule of thumb for printing digital images on a color inkjet printer

    • Divide the number of pixels in each dimension of the image by 300 and you will get the largest image size you should print successfully

      • 800/300 X 600/300=2.67” X 2.0” print size

        But my printer can print 600dpi


File size

File Size

  • The more pixels in an image the larger the file size

  • Large files take a long time to download if you put them on web pages or send them in an email

    • Some e-mail companies limit the size of files you can put in an attachment

  • A PowerPoint presentation using images that have a large file size will take a longer time to load and won’t look better on the screen

  • A printed picture will look better with more pixels and a large file size


  • Image types

    Image Types

    • Pictures can be different file types

      • You can tell by their file extension

    • Most common file types for images

      • .jpg

      • .gif

      • .bmp or .wmf - ClipArt


    Take the quiz

    Take the Quiz

    Now that you have learned something about Pixels, Resolution, File Size and File Types it is time to take the Quiz in Oncourse. If you have difficulty with the quiz repeat this PowerPoint presentation and take it again.

    END SHOW


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