Hide the edges smoothly using a gradient mask. Pick the gradient Tool, create the below gradient in the Options Panel.

使用渐变遮罩使边缘平稳地消失。选择渐变工具，在选项面板中创建下面的渐变。

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Next with the Elliptical Marquee Tool selected, click on the Subtract From Selection option on the Tool's Options Panel.

下一步的椭圆选框工具选中，单击减去从选项的工具的选项面板。

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Double click on the Pencil Tool (n) in the Tools Panel to bring up the Pencil Tool Options.

双击对铅笔工具(n)在工具面板把铅笔工具选项。

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Windows 7 users can change the size of text and icons using the Display control panel and can zoom in on text using a magnifier tool that can be activated in the Ease of Access control panel, which contains other options for making items on the computer easier to see.

WSJ: Mossberg's Mailbox: Larger Mac Font