Photoshop Unit 3 Working with Selections

Photoshop Unit 3 Working with Selections

by Tonneche Brown

​Making changes to an area within an image in Photoshop is a two-step process. You first select the part of an image you want to change with one of the selection tools. Then, you use another tool, filter, or other feature to make changes, such as moving the selected pixels to another location or applying a filter to the selected area. You can make selections based on size, shape, and color. The selection process limits changes to within the selected area. Other areas are unaffected.

Multiple Choice

Making changes to an area within an image in Photoshop is a __________ process.

• one-step

• two-step

• three-step

• four-step

Fill in the Blank

Once you’ve made a selection, what area of the image can be edited?

​The best selection tool for a specific area often depends on the characteristics of that area, such as shape or color. There are four types of selections.

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​Geometric selections The Rectangular Marquee tool selects a rectangular area in an image. The Elliptical Marquee tool , which is hidden behind theRectangular Marquee tool, selects elliptical areas. The Single Row Marquee tool and Single Column Marquee tool select either a 1-pixel-high row or a 1-pixel-wide column, respectively.

Multiple Choice

There are ______ types of selections

• one

• two

• three

• four

Fill in the Blank

The ___________________, which is hidden behind the

Rectangular Marquee tool, selects elliptical areas.

Fill in the Blank

The ______________ selects a rectangular area in an image.

Freehand selections The Lasso tool ( ) traces a freehand selection around an area. The Polygonal Lasso tool ( ) sets anchor points in straight-line segments around an area. The Magnetic Lasso tool ( ) works something like a combination of the other two lasso tools, and gives the best results when good contrast exists between the area you want to select and its surroundings.

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​Edge-based selections The Quick Selection tool ( ) quickly “paints” a selection by automatically finding and following defined edges in the image.

Color-based selections The Magic Wand tool ( ) selects parts of an image based on the similarity in color of adjacent pixels. It is useful for selecting odd-shaped areas that share a specific range of colors.

Multiple Choice

The __________________ sets anchor points in straight-line segments around an

area.

• Lasso tool

• Magnetic Lasso tool

• Polygonal Lasso tool

• Single Row Marquee

  tool

Fill in the Blank

The ____________ quickly “paints” a selection by

automatically finding and following defined edges in the image.

Fill in the Blank

The ___________ selects parts of an image based

on the similarity in color of adjacent pixels. It is useful for selecting odd-shaped

areas that share a specific range of colors.

The Quick Selection tool provides one of the easiest ways to make a selection. You simply paint an area of an image, and the tool automatically finds the edges. You can add or subtract areas of the selection until you have exactly the area you want.

Fill in the Blank

Which tool provides one of the easiest ways to make a selection?

​The Magic Wand tool selects all the pixels of a particular color or color range. It’s most useful for selecting an area of similar colors surrounded by areas of very different colors. As with many of the selection tools, after you make the initial selection, you can add or subtract areas of the selection.

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The Tolerance option sets the sensitivity of the Magic Wand tool. This value limits or extends the range of pixel similarity. The default tolerance value of 32 selects the color you click plus 32 lighter and 32 darker tones of that color. You may need to adjust the tolerance level up or down depending on the color ranges and variations in the image.

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If a multicolored area that you want to select is set against a background of a different color, it can be much easier to select the background than the area itself. In this procedure, you’ll use the Rectangular Marquee tool to select a larger area, and then

use the Magic Wand tool to subtract the background from the selection.

Fill in the Blank

How does the Magic Wand tool determine which areas of an image to select? What istolerance, and how does it affect a selection?

​Use the binder to answer the following questions

Multiple Choice

Which  menu do you use to rotate?

• Edit > Transform > Rotate

• Image > Transform > Rotate

• File > Transform > Rotate

• Window > Transform > Rotate

• Window > Transform > Rotate

Multiple Choice

Which menu do you use to scale?

• Image > Transform > Scale

• Edit > Transform > Scale

• File > Transform > Scale

Multiple Choice

To reposition a selection, without releasing the mouse button, hold down the spacebar and drag

• True

• False