效果图：

onmousewheel="return bbimg(this)" style="cursor: pointer" onclick=Javascript：window.open(this.src); src="http://www.hongen.com/pc/tools/media/pictool/phshopjq/pshop021/img/ps021021.jpg" onload="JavaScript：if(this.width>screen.width-500)this.style.width=screen.width-500;">

　　操作过程：

　　1. 打开一幅图像，这里用的是一幅风景图像，如下图所示。

onmousewheel="return bbimg(this)" style="cursor: pointer" onclick=javascript：window.open(this.src); src="http://www.hongen.com/pc/tools/media/pictool/phshopjq/pshop021/img/ps021001.jpg" onload="javascript：if(this.width>screen.width-500)this.style.width=screen.width-500;">

　　2. 在图层面板中将“背景”层拖到底部的新键按钮onmousewheel="return bbimg(this)" style="cursor: pointer" onclick=javascript：window.open(this.src); src="http://www.hongen.com/pc/tools/media/pictool/phshopjq/pshop021/img/ps021002.gif" onload="javascript：if(this.width>screen.width-500)this.style.width=screen.width-500;">，复制“背景”层为“背景副本”层。

onmousewheel="return bbimg(this)" style="cursor: pointer" onclick=javascript：window.open(this.src); src="http://www.hongen.com/pc/tools/media/pictool/phshopjq/pshop021/img/ps021003.gif" onload="javascript：if(this.width>screen.width-500)this.style.width=screen.width-500;">

　　3. 此时“背景副本”层为当前层，执行“编辑｜变换｜数字”命令，在对话框中设置宽高为95%，如下图所示。

onmousewheel="return bbimg(this)" style="cursor: pointer" onclick=javascript：window.open(this.src); src="http://www.hongen.com/pc/tools/media/pictool/phshopjq/pshop021/img/ps021004.gif" onload="javascript：if(this.width>screen.width-500)this.style.width=screen.width-500;">

　　4. 单击图层面板上的新建按钮onmousewheel="return bbimg(this)" style="cursor: pointer" onclick=javascript：window.open(this.src); src="http://www.hongen.com/pc/tools/media/pictool/phshopjq/pshop021/img/ps021002.gif" onload="javascript：if(this.width>screen.width-500)this.style.width=screen.width-500;">，创建一个新层“图层 1”。

onmousewheel="return bbimg(this)" style="cursor: pointer" onclick=javascript：window.open(this.src); src="http://www.hongen.com/pc/tools/media/pictool/phshopjq/pshop021/img/ps021005.gif" onload="javascript：if(this.width>screen.width-500)this.style.width=screen.width-500;">

　　5. 执行“编辑｜填充”命令，给新图层填充50%的灰色，填充对话框如下图设置。

onmousewheel="return bbimg(this)" style="cursor: pointer" onclick=javascript：window.open(this.src); src="http://www.hongen.com/pc/tools/media/pictool/phshopjq/pshop021/img/ps021006.gif" onload="javascript：if(this.width>screen.width-500)this.style.width=screen.width-500;">