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Introducton to Adobe Photoshop
The Zoom Tool  

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[Zoom Tool] As you might imagine, the zoom tool allows you to zoom in on the image to get a better idea of the actual pixel makeup of a section you are working on. It is fairly easy to use the tool. You simply click on the zoom icon and then click on the canvas.

The canvas will zoom one step for each mouse click. Thus, if you click two times, the image will zoom to a 3 to 1 aspect ratio. You'll see things much more clearly.

[Zoom Tool]

Zoom state is recorded in the title bar of the canvas window and to return to a zoom ratio of 1:1 you simply double click the zoom tool icon in the toolbox or use the Zoom 1:1 button in the Zoom options palette.

[Zoom Tool]

Don't get confused between zooming and scaling. When You zoom an image, it is only zoomed from your perspective. You have not changed the image at all. If you copy a zoomed image and paste it onto another canvas, it will be pasted in its 1:1 size. If you wish to actually scale an image larger, you should use the menu item Image and choose the "Effects --> Scale" option

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