Individual Instruction
Optimizing Resolution in Graphic Files

Test Questions & Feedback

Susan Connell
EDTEC 671
Spring 2005

Goal:
Given a series of graphic files, the learner will be able to select resolution, dimensions and file size to be optimized for a variety of specified uses.

Test Items

Objective 1: Resolution Concept Definitions

• What is the smallest editable unit in a digital image?
  Pixel (fill in the blank)
  [Feedback: A pixel (short for picture element) is an individual square of light that is the smallest editable point in an image.]
• How many pixels are in an image that is 400 high by 600 pixels wide?
  2,400 (fill in the blank)
  [Feedback: Simply multiply the pixel width by the pixel height to get 2,400]
• Which image has the highest resolution?
  (multiple choice written description for 4 images)
  [Feedback: Resolution represents the number of pixels that occupy a linear inch of an image.]
• Sequence these images from lowest to highest resolution
  (drag & drop 4 images in order)
  [Feedback: You can't always tell by looking, but if it's not obvious, multiply the pixel width by the pixel height to see which image has the most pixels.]
• What are the dimensions (in inches) of an image that is 360 pixels by 360 pixels? (multiple choice trick question)
  • 5" x 5"
  • 1.2" x 1.2"
  • 2.4" x 2.4"
  • All of the above, depending on the resolution.
    [Feedback: If you don't know the resolution of the image, you won't be able to translate the pixel dimension to inches.]
• Which method of changing dimensions of an image involves cutting out unwanted pixels? (multiple choice)
  • Resampling
  • Resizing
  • Cropping
  • Erasing

Objective 2: Resolution Principles

• An original image is 640 x 480 pixels, but space available for it on a web page is only 480 x 480 pixels.
• Which image has the same proportions (or aspect ratio) of an image that is 8" x 10"? (hot spot)
• If an original image is 16" by 20" at 72 pixels/inch, approximately what size will it be at 300 pixels/inch? (multiple choice)
• If you need a final high-resolution image for a printed display, which image would have the best size to start with? (multiple choice)
• If you have a series of eight photos taken with a 2 megapixel digital camera at 1200 by 1600 pixels that you want to display on a web page what will happen if you don't resample them? (multiple choice)
• What size would be a good choice for resampling? (hot spot)

Objective 3: Resolution Procedures

• You have received an image that is
• Change document dimensions to specified size

Outcome Quiz: Applying Resolution Principles and Procedures

• Reformat a high-resolution image to send in an e-mail
• Resize a low-resolution image to fit in a specified space on a web page
• Format a high-resolution image to be output as a 4x6 print at Costco

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