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I think I've accidentally ticked some option for the Rectangular Marquee tool. If I drag a selection over a part of an object and then hold in Alt to duplicate that selection, the selection snaps to the coloured pixels and removes the pixels that are white (not part of the object).

It's snapping to the pixels in the selection and not including my original selection.

Thanks in advance for your help.

Shaun

Original Selection

Modified selection

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  • Sorry forgot to include the program, it's Adobe photoshop. – Shaun Kilbride Dec 15 '20 at 14:37
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Assumption: the "white" in your image isn't really white. It's transparent, most likely a layer with transparency over another white layer below it.


Transparent areas of a selection are not seen as part of the selection when you duplicate. After all, you can't "duplicate" transparency.

This is standard behavior for selections. When you drag to duplicate, Photoshop reduces the selection to only the actual pixels which can be duplicated.

If the white area in your selection is actually filled with white pixels, then the selection would remain as you set it, because you can duplicate white pixels.

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  • Thanks for your input, I've sorted it out. – Shaun Kilbride Dec 16 '20 at 9:01
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This sounds like it's working the way it's intended, assuming the white is either transparent or not part of the layer you're working on.

The box drawn with the marquee tool can be moved freely (will show a cursor with a white box w/ dotted border) but this is not manipulating the content within the selection, it's just repositioning the selection itself. As soon as you manipulate the content within selection itself (ie. switching to the move too, or in this case using alt to duplicate it) the marquee will snap to your actual selection, excluding empty space.

Sometimes a pixel, low-opacity brush cast or other sort of information on the canvas which is not readily apparent can make it seem like the selection is retaining empty areas.

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  • Thanks for your input, I've sorted it out. – Shaun Kilbride Dec 16 '20 at 9:01

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