6 Answers to Review Questions. “Digital Media Primer” Yue-Ling Wong
Chapter 3
When applicable, please select all correct answers.
1. What are the different types of scanners?
2. What is the method of acquiring digital images besides scanning?
3. Resampling an image is often referred to as _____.
A. rotating
B. scaling
C. translating
D. repositioning
5. The Apple iPhone 4S camera can take digital photographs with pixel dimensions of 3264 2448 pixels.
i. Show the math that the resolution capability of the camera is 8 megapixels.
ii. Show the math that with these pixel dimensions, the physical dimensions of the printed image are about
10-inch 8-inch if you print it at 300 ppi.
6. Suppose that you scan a 3-inch 5-inch photograph in at a resolution of 300 dpi.
i. What are the pixel dimensions of the scanned image? _____ _____ pixels
ii. What will the physical dimensions of the image be if you print it at 300 ppi,
pixel dimensions? _____ inches _____ inches
iii. What will the physical dimensions of the image be if you print it at 600 ppi, without altering
7. True/False: When a digital image is printed, each image pixel is represented by one printer ink dot.
8. is in _____.
A. square inches
B. linear inches
9. True/False: The optimization of tonal adjustment at the time of capturing images scanning or digital
photography does not matter because you can always extend the tonal range of the image to any extent
afterward in Photoshop to recover the missing color information.
10. Given here are the general steps of image retouching of a scanned image.
i. Order the steps by labeling 1 through 6.
_____ Adjust the overall contrast or tonal range of the image
_____ Crop and straighten the image
_____ Fine-tune specific parts of the image
_____ Remove color casts
_____ Remove dirt and dust
_____ Sharpen the image
ii. Explain your choice for the first step.
iii. Explain your choice for the last step.
11. Suppose you want to scan part of a photograph to use in a digital collage. The part of the picture you want
to scan is 2-inch 2-inch on the photograph. You want this scanned piece to appear as 6-inch 6-inch in the
final collage that will be printed out at 300 ppi.
If you scan the picture at a resolution insufficient to print it at a size of 6-inch 6-inch at 300 ppi, you will
12. What kind of images are GIF files most appropriate for?
A. images with big areas of solid colors
B. continuous-tone photographs
C. images with lots of gradients
13. What kind of images are JPEG files most appropriate for?
14. Shown in Figure 3.42 is a grayscale image and its histogram:
Figure 3.42 (a) A
i. Match each of the bars in the histogram to the color it represents. (Draw arrows linking each bar and the
color in the grayscale image in Figure 3.42.)
ii. To maximize the contrast and tonal range of this image, what changes of the sliders should be made? Show
the new positions of the sliders in the histogram provided in Figure 3.42.
each of the four image outlines in Figure 3.42 , label the areas with the resulting grays. Specify whether it is
black, white, or gray. If it is gray, estimate an RGB value for that gray.
8 Answers to Review Questions. “Digital Media Primer” Yue-Ling Wong
(a)
(b)
(c)
(d)
9 Answers to Review Questions. “Digital Media Primer” Yue-Ling Wong
Figure 3.42 Four pairs of histograms and outlines of images, the colors of which are to be predicted based on
the adjustment made in their histograms.
16. What are the two possible ways to create a SVG?
17. What are the two possible ways to show your vector graphics on Web pages?