Rectangle in an image

[Stribor45]

i have image that has rectangle shape in it.  i want to create rectangle in exactly same position and exactly same size on a different layer.  How to do this?

[Bob_Hallam · Accepted solution]

If that is the only shape on a layer just copy the layer.  If it's in the Background layer then select the rectangle using the rectangle selection tool.  If the angle is not perfectly square, just use Transform selection to adjust the selections final shape and angle to match the one in the background layer

[Stribor45]

It's not the only shape. It's part of many other things in image but how do you use selection tool to match exactly that rectangle without missing one pixel while selecting?

[Trevor.Dennis]

1. Use the Pen tool to get the best match, and Ctrl click the resulting work path to load it as a selection.
2. Copy the selection to a new layer.
3. If you have missed a few pixels outside the selection, Free Transform the new copied layer, and make it ever so slightly larger to cover the missed pixels.
4. If you have enclosed some erroneous pixels, lock the layer opacity, and use the Clone tool to overwrite with suitable content.

To give you better response, we'd need to see the image at a reasonable resolution.

[Bob_Hallam]

As I mentioned above you can transform the selection to match the original rectangle as a way to match it exactly.  Or use quick mask after the rectangle selection is made and reselect that area in quick mask leaving a bit around it to see the edges and transform that area to match the rectangle you want to match.  You can zoom in to see it properly.  Or as Trevor mentioned use the pen tool at the pixel level create a work path.  Double click that path to save a path that can be renamed if you wish.  Then Command-Click (Mac) or Control-click (PC) to make the path a selection.  Make a new layer and fill that selection with your rectangle color.