Digital Imaging Quiz

What is a pixel?

• a raster image editing program that is free and open-source

• a tiny square of light capable of displaying millions of colors and shades

• a mathematical formula that creates geometry displayed on a screen

• a single photon of light that transmits color to the human eye

Answer explanation

A pixel is a tiny point of light that when put together on a grid makes a digital image.

True or False: Raster images are always superior to vector images.

• true

• false

Answer explanation

Sometimes, vector images are better, especially when displaying text, creating illustrations, or create art that can be resized to any dimension without losing quality.

What is NOT an advantage of raster images? (Choose all that apply)

• more lifelike and photorealistic images

• more detail and continuous color possible

• the default format for all digital photography and video

• easy to resize without losing any quality or information

Answer explanation

Raster images are perfect for complex, lifelike images with lots of realistic colors and shadows, but not so great for resizing on the fly.

What is resolution?

• a description of how blurry or sharp an image is

• the number of colors available in a raster image

• the file size of a raster or vector image

• a measurement of the number of pixels in an image

Answer explanation

Resolution tells us how many pixels of information are in an image, which tells us how sharp and detailed the picture quality can be.

What command is best to quickly remove a mistake or to step back in a process and try again?

• Redo

• Save

• Undo

• Delete

Answer explanation

In all graphics editing software, the Undo command lets you go back in time and get rid of your most recent action or edit so you can try again.

Which command lets you instantly cover a selected area with a solid color?

• the fill command

• the color picker

• the line tool

• the paintbrush command

Answer explanation

To quickly fill an area with one color, use the fill tool.

If you want the edges of your digital brush to be feathered and blended, you should ___________.

• lower the hardness

• increase the hardness

• invert the colors

• blur the image

Answer explanation

The hardness of a digital brush describes how sharp or blurry the outside of the brush is.

What is the term for the following transition between colors?

• vector

• foreground color

• dithering

• gradient

Answer explanation

A gradient allows you to select two or more colors, and let the computer create a smooth transition between them.

Which of the following images shows an object at 50% opacity?

• Top - 1st

• 2nd

• 3rd

• Bottom - 4th

Answer explanation

Opacity is how much you can see through an object-- the more opaque it is, the less transparent.

What happens the more you compress a JPEG image?

• Quality goes up, file size goes up

• Quality stays the same, file size goes down

• Quality goes up, file size goes down

• Quality goes down, file size goes down

Answer explanation

Compressing an image sacrifices image quality to make the file size smaller.