Create a circle around the corner using Marquee tool and fill with Black color on a new layer. Then go to Select >Modify >Contract with 2px and then press Delete.
Create a circle around the corner using Marquee tool and fill with Black color on a new layer. Then go to Select >Modify >Contract with 2px and then press Delete.
在刚刚绘制的矩形左上角使用椭圆工具绘制一个椭圆,使用黑色进行填充,然后点击选择-修改-收缩,参数为2像素,点击删除键.