This will allow you to knockout the subject, but remember to actually Crop the image, you can only Crop in a Square or a Rectangle. Save new Selection as something different, i.e. Once you have the background selected, Save Selection (name it something like "Outline."), then choose Select>Modify>Contract, again experimenting with the # of pixels, as there is not a direct way to specify 5mm, but you could hit Ctrl-R to get the rulers, set units to mm, then do some guides to indicate 5mm from the subject in one spot, and match that, as you explore the Contract setting. You can also press Ctrl, as you do more selecitons, if you are missing a few to add to the Selection. You may need to experiment with the tolerance setting, but if you have white, start with a lower # and work up a bit at a time. Question: is your subject image on a white background, all of the way around it? If so, use the Magic Wand Tool, to select the white area. I have a photo with a white background and i would like to crop aorund the edges smoothly (important!) leaving a white space of about 5mm around the edges, how can i do this in photoshop? i can only find cropping tools for predefined shapes.
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