Quiz: A Vocabulary for Images

Here are 11 terms you should know. You may be familiar with most of them through the work you have done with Pixelmator.

pixel: stands for picture element. It’s the smallest part of an image on a screen.
resolution: how much information there is in an image, how many pixels/inch
opacity: how much of an image is showing through. 100%, it’s all showing, 0% means nothing is showing
hue: what we normally think of as color: red, yellow, green, blue, etc.
saturation: how much of the color is there. The thicker richer the color, the greater the saturation.

value: the darkness or lightness of the image
bit-mapped image: an image made up of pixels. When you blow it up, you may notice “jaggies” if there isn’t enough resolution.
vector-based image: an image built from mathematical formulas. As you enlarge it, the math scales the image up, and the resolution stays very high.
additive color: color you get through a screen. Colors are created in the screen and projected to the eye
subtractive color: color you see from paper, or paint. White light hits the paper, and all the colors are absorbed by the paper, subtracted, except for the color you see.
RGB  vs. CMYK: Red, Green and Blue create all the colors on screens. Cyan, Magenta, Yellow, and Black create all the colors on paper, or paint.

Here’s what happens when you enlarge a bit-mapped image too far!


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