Digital Media Chapter 2

2^24

An 24-bit color depth allows ___ colors.

1. it has larger pixel dimensions 2. it has a larger file size 3. the sampling step uses a higher sampling rate

If a digital image captured at a higher resolution, ___than it would have been captured at a lower resolution.

1. it has more different colors 2. it has a larger file size

If a digital image has a higher bit depth, ___than it would have been at a lower bit depth.

an infinite number of color shades and tones in an analog image is mapped to a set of discrete color values

In the quantization step, to capture an analog image to a digital image, _____.

RGB and CMY

Which of the following color models take(s) the form of a color cube?

HSB

Which of the following color models take(s) the form of a hexacone?

larger pixel dimensions of the image and higher color depth

Which of the following factors will increase the file size of a digital image?

hue

Which of the primaries in the HSB color model takes the form of a color wheel?

individual pixels which represent spatial samples of the image or scene

Bitmapped images are composed of ___.

the pixel dimensions of the resulting digital image

Recall that the process of converting from analog to digital information is a 2-step process--sampling and quantizing. In capturing an analog image to a digital image, the sampling rate affects ______.

Digital devices have different color gamuts. Some colors that can be produce on screen cannot be produced by the printer.

Why don't the colors in the printed image look exactly the same as you see on computer screen?

1. captures more details than the same image stored at a lower resolution 2. has a larger file size than the same image stored at a lower resolution 3. has larger pixel dimension than the same image stored at a lower resolution.

A digital image captured at a higher resolution ___.

2^8 = 256

An 8-bit color depth allows ___ colors.

doubled

Generally speaking, how does the file size change if the bit depth of an image is increased from 8-bit to 16-bit?

3x

Generally speaking, how does the file size change if the bit depth of an image is increased from 8-bit to 24-bit?

4x

Generally speaking, how does the file size change if the number of pixels of both the width and height of an image are doubled?

doubled

Generally speaking, how does the file size change if the total number of pixels of an image is doubled?

lossy: JPEG lossless: TIFF, PNG, GIF, PSD

Give one example of the image file type that supports lossy compression and one that supports lossless compression.

aliasing

Sometimes when you magnify a picture on your computer screen, lines that should be straight lines appear to be jagged. This effect is called ___.

ease of editing the image content pixel by pixel

The main advantage(s) of bitmapped images over vector graphics is (are) ___.

1. scalability (ie., resolution independence of images) 2. more compact file size compared to vector graphics

The main advantage(s) of vector graphics over bitmapped images is (are) ___.

digitization

The process of converting from analog to digital information

picture element

The term "pixel" is contracted from the words ___ ___.

true

True/False: A pixel is a point sample, not a little square.

true

True/False: An 1-bit color depth allows only 2 colors.

false

True/False: An 1-bit color depth allows only black and white colors.

mathematical descriptions of image elements which include points, lines, curves, and figures

Vector graphics are composed of ___.

CMY: 100%, 100%, 100%

What are the CMY values for black?

CMY: 100%, 100%, 0%

What are the CMY values for blue?

CMY: 100%, 0%, 100%

What are the CMY values for green?

CMY: 0%, 100%, 100%

What are the CMY values for red?

CMY: 0%, 0%, 0%

What are the CMY values for white?

CMY: 0%, 0%, 100%

What are the CMY values for yellow?

RGB: 0, 0, 0

What are the RGB values for black?

RGB: 0, 0, 255

What are the RGB values for blue?

RGB: 0, 255, 0

What are the RGB values for green?

RGB: 255, 0, 0

What are the RGB values for red?

RGB: 255, 255, 255

What are the RGB values for white?

RGB: 255, 255, 0

What are the RGB values for yellow?

hue, saturation, brightness

What are the primaries in the HSB color model?

cyan, meganta, yellow

What are the primary colors in the CMY color model?

red, green, blue

What are the primary colors in the RGB color model?

cyan, megenta, yellow

What is the color mixing method for the CMY color model?

cyan, megenta, yellow

What is the color mixing method for the RGB color model?

BMP, JPEG, PNG, GIF, JPG, PSD, TIFF

Which file extensions indicate pixel-based files?

EPS, WMF

Which file extensions indicate vector graphic files?