So how do digital images work on a computer? What are they made of? And why should I bother to know this information? To answer the last question is simple. Knowing how digital images work is to know how to better implement them and use them in a variety of ways. For instance: What differences exist when preparing an image for a web site versus printing to an inkjet printer? Why do all these different file formats for images exist for images such as .jpg, .gif, .png, and .tif? And how do I choose which file format to use?
Reading: Multimedia Projects in the Classroom, pp. 11-20.
Applications/Equipment Used: Web Browser & Microsoft Word.
Lessons: As a class, we will review the Cornell University Digital Imaging Tutorial and the Wellesley University Screen Resolution Basics.
Links:
Kodak Digital Imaging Fundamentals
Cornell University Digital Imaging Tutorial
Wellesley University Screen Resolution Basics
Lab Procedure:
1. Estimating the pixel dimensions of a digital image.
- Open a web browser and find a photo that you like from a newspaper's web site such as cnn.com , nytimes.com , or foxnews.com .
- Right-Click the mouse on the image you like and Select Copy.
- Open a new word document and Select Edit>Paste. The image should now be in your word document.
- Measure in inches the width and height of your image and type these dimensions under the image.
- Estimate the pixels per inch (ppi) displayed by your monitor. Measure the monitor width and height in inches. Check the screen resolution setting, in the "Display Properties" control panel. Type the monitor dimensions in inches, screen resolution in pixels, and calculate the estimated ppi rounded to the nearest whole number.
- Using the ppi that you have estimated and the measured width and height in inches of your pasted photo, calculate the pixel dimensions of the photo.
- Copy and paste a second photo from a web site. Again measure the width and height in inches, and calculate the pixel dimensions of the photo using your estimated ppi.
3. Send your word document to my AC230 Digital Dropbox on York’s Blackboard. The subject line should give your name and the lab number (Frank Jones Lab 13).
3 comments:
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