Preview Tutorial - Extract Shape

Stamp: 18 February 2008 | 9 Comments | Back to Previous Page

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With Preview alone, you can do the most basic image editing, such as Extract Shape.

Pick Your Image

If your image is in the form image type file, i.e. JPEG, GIF, PNG, etc, you can highlight the file and then choose Open With ▸ Preview (if Preview hasn't been set as your default application) or simply use Command-A.

However, if you want to pick your image from existing Application's icon, you can do these steps :

  1. Highlight the icon
  2. Copying it into clipboard (Command-C)
  3. Open Preview
  4. Select File ▸ New From Clipboard (Command-N)

I picked : MacBook Air which I just captured from Apple.

Pick the Object

Let's say you only want the MacBook Air's pic. I'll remove the background (and the envelope) from MacBook Air.

The initial image looks like this inside Preview.

Select Extract Shape Tool

Extract shape tool can be selected from your Preview tools collection. It's under the tool named Select, click and hold on it then a pop up menu will appear. Then you can now select Extract Shape Tool.

Draw the Region

Next, draw an enclosing region using your cursor. After drawing the region, you can adjust it by dragging and dropping some of its nodes.

Press Return if you've done. The area outside the region will be deleted while the area inside will remain as it is.

Clear Background

If you've noticed, after pressing Return your working tool is automatically changed to Instant Alpha. This tool is used to adjust the alpha transparency of particular portion of your image.

Click and hold on area outside the MacBook Air and then drag your mouse around. You can see while the percentage is decreasing, the enclosed red region is shrinking. After you released your mouse, the enclosed area will be cut off.

Erase Unnecessary Details

Repeat the step before. But this time, it's for the small details around the main object. It will be a little bit tough and tedious because you need to be careful not to wrongly erase the necessary parts of the image. If you happen to wrongly erase some parts, Command-Z or Undo comes for rescue.

Utilize Zoom Tool

You can use Command [+] to zoom-in your image or Command [-] to zoom-out followed by clearing out (setting the opacity to 0) certain parts of the image using Instant Alpha Tool.

After 5 Minutes of Cutting Here and There..

You can save it, publish it, or maybe teach other fellow Mac users how to make it.

Categories: Imaging , Utilities | Post Comment | Back to Top

Related Entries:

  1. 10 Handy Mac Preview Application Tricks as Image Editor
  2. Preview Tutorial - Mark Up Tools
  3. Preview: Handy Color Picker [Leopard]
  4. Open PDF Link in Preview
  5. Batch Resize Images
  6. Sort Images with Leopard Preview
  7. Preview Tutorial - Reading PDF Files
  8. Preview Tutorial - Resize at Ease

9 Comments

#1

Himavanth B

thanks great work i used to have a problem of making png files but not now... thank u very much once again..

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#2

kelly

wow thanks! :)

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#3

Chris G

Um....Photoshop?

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#4

Matt

This is a very useful tip

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#5

Phil

Chris G, I don't have Photoshop.

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#6

Chop

there is no reason you couldn't have photoshop. if you know were to go, it costs you nothing. if you are morally opposed to this then GIMP is a great open source alternative.

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#7

Andrew

This is a very very trick. I knew Preview has a lot of tricks up its sleeves. Very helpful indeed

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#8

Peter

Chop: You're suggesting a solution that is not only more difficult than what this post is suggesting, but also involves installing extra, large software. How is that any easier than using what's /built in/?

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#9

Bruno

Obrigado !

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