1. ctrl+o 打开张图片
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2. ctrl+j 复制一个图层,要养成复制图层的好习惯
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3. 选择椭圆工具
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4. 设置椭圆工具的值为形状,无填充,无描边
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5. 按住shift可以画出圆形
6. ctrl+enter 建立选区
7. ctrl+shift+i 建立反向选区
8. 选择图层1,按delete键将反选的区域删除
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9. 将背景层隐藏掉
10. ctrl+d取消选区
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11. ctrl+s保存为png或者jpg格式
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12. 测试图片是否成功,这里用HTML代码测试
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
body{
background-color: pink;
}
</style>
</head>
<body>
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</body>
</html>
测试结果:
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