Week Three: Review Questions

Kathryn Fletcher, kfletche.geo@yahoo.com 

Part One

1. Describe what the Magic Wand does. How do you add to and take away from selections with the Magic Wand?
 The Magic Wand normally selects a fill area where all of the pixels are the same color. To add an area to the selection, hold down the SHIFT key while clicking with the tool; to delete an area, hold down the CTRL key. The way we used it this week: we selected an area around an image with the freehand tool, then used the Magic Wand tool holding down the control key to subtract the background from the selection -- being careful to then click on the background portion, not the desired image.
2. You have an image opened in PSP. You want to paste this image as a transparent selection into another image. What steps must you take to accomplish this task?
  1. set the background in the palette to be the background color of the image by choosing the dropper tool and right clicking on the background of the image
  2. change the background color to be transparent using the Colors > Set Palette Transparency command
  3. go ahead and respond yes to the warning about the image being reduced to a single layer with decreased color depth.
  4. choose a palette reduction technique, for instance "optimized median cut".
  5. set the transparency value to the current background color and click on OK
  6. copy the image (Ctrl - C keyboard shortcut)
  7. in the other image, use the Edit > Paste > As Transparent Selection command and place the image in the desired location on top of the new image.
3. You have decided you would like to see your image pixel by pixel so that you can make some fine color corrections.  What steps would you have to take to see each individual pixel?
Zoom in until you are seeing the image 10:1. Choose Grid from the View menu. If the grid is too large, go to View > Change Grid and Guide Properties and change the horizontal and vertical spacing to be 1. The grid now corresponds to the pixels.

Part Two

1. A color ________ is a numerical expression that exactly describes a color's appearance.
 b. value
2. A major advantage of interlaced over non-interlaced GIF files is that they
 c. give the user a preview of the entire image before it is completely loaded.
3. An animated GIF file is composed of several graphic images, each one slightly different, that are displayed in rapid succession to create the desired animated effect.
TRUE
4. On the Web, the intensity of each of the primary colors is assigned a number from 0 (absence of color) to ____ (highest intensity).
FF (hexadecimal for 255). Attribute colors can be specified as a 6 digit hexadecimal number made of 3 pairs where the first 2 digits correspond to how much red, the next 2 digits for green, and the last 2 digits for blue. For instance, black would be #000000, white would be #ffffff, bright yellow would be #ffff00, and you'd get gray anytime all 3 pairs are the same numbers other than 00 or ff. Since PCs and Macintoshes use  different color spaces for mapping 256 colors, there is a palette of 216 web-safe color values made of those combinations that correspond to colors that the platforms display the same. This is perhaps less of an issue than it was in the early days of web pages as more computer users have monitors set to display more than 256 colors.

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