There's two ways you can do it. You can make a new layer and use the rectangular marquee tool, fill it in with the white bar,mess with the opacity settings,move the white bar layer behind the render layer. Another way I do it is use the rectangle tool,then move the rectangle layer behind the render layer,and mess with the opacity settings. I hope this makes sense. xD
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If anyone could tell me how, that would be lovely. Thanks!