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Updated on May 21, Tweet Share Email. Was this page helpful? Thanks for letting us know! Email Address Sign up There was an error. Please try again. You're in! Thanks for signing up. There was an error. Release your spacebar to switch back to the Polygonal Lasso Tool:. As I make my way along the top of the building, I come across what appears to be a problem. Part of the design in the roof is actually rounded, which is bad news for the Polygonal Lasso Tool since it can only draw straight-sided selections.
Fortunately, Photoshop makes it easy to switch between the Polygonal Lasso Tool and the standard Lasso Tool for occasions such as this. This temporarily switches you to the standard Lasso Tool, and with it, we can easily trace around any rounded or curved areas of an object:.
You'll switch back to the Polygonal Lasso Tool, at which point you can continue moving around the object and clicking to add more points:. Once I've finished drawing my selection around the building, I'll make sure I get all of the edge pixels in the sky along the sides and top of the photo by clicking with the Polygonal Lasso Tool into the gray pasteboard area around the photo.
Photoshop won't select the pasteboard, it will select only the pixels in the image:. To complete the selection, I'll click once again on my initial starting point, and with that, the sky in the photo is now selected:.
If we look in my Layers panel, we can see that my document is made up of two layers. The photo of the building is on the top layer, and a photo of a dark, cloudy sky sits on the Background layer below it:. This converts my selection into a layer mask , and we can see that a layer mask thumbnail has been added to the top layer.
With the sky in the building photo now hidden, the clouds in the photo below it show through in the document:. You can also simply click anywhere inside of the document with the Polygonal Lasso Tool or with any of Photoshop's other selection tools. Whichever of the three lasso tools you selected last will appear in the Tools panel.
Select the others from the fly-out menu. Click to add points around the object or area where you need the line to change direction. A small circle appears in the bottom right of the cursor icon when you're close enough to the initial point to complete the selection. Clicking in each of the four corners with the Polygonal Lasso Tool, beginning with the top left and moving clockwise.
Photoshop's Paste Into command allows us to paste an image directly into a selection. Figure 1 below shows the freehand lasso tool Options bar. After drawing a selection with the lasso tool, if you hold down the Spacebar this lets you reposition the placement of the selection.
Release the Spacebar and you can continue to modify the shape as before. When the polygon lasso tool is selected you can click to start the selection, release the mouse and position the cursor to draw a straight line, click to draw another line and so on. To complete a polygon lasso tool selection, position the cursor directly above the starting point a small circle icon appears next to the cursor and click on the start point.
Figure 2 below shows the polygon lasso tool options bar. The magnetic lasso tool can be used to create semi-automatic outline selections. The sensing area width can be set in the Options bar and when you move the tool along the edges in a picture, the magnetic lasso is able to sense where that edge is and create a selection that follows the edge. You continue to brush along the edges until the outline is complete and then close the selection in the usual manner by clicking on the start point.
Figure 3 below shows the magnetic lasso tool Options bar. Anti-aliasing is also an option. This allows you to smooth any jagged edges that may appear when copying and pasting selections from images. Once you become adept at Photoshop, you will likely find yourself using the Polygonal Lasso more often than any of the other selection tools. You can also use this tool in combination with the other lasso tools to select more difficult shapes. For example, you can use the Polygonal Lasso to select the base of an ice cream cone, and then use the Circle Marquee to add the scoop of ice cream to the selection.
For those, you should use the standard Lasso or Magnetic Lasso tool. However, you can combine the standard Lasso with polygonal to overcome this obstacle. The Polygonal Lasso should also be avoided if you need standard shapes. It is unnecessary to use polygonal for squares, rectangles and circles, as the basic marquee tools are more than enough for them.
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