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Is zooming lossless?


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#1
CelestialTeardrop

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When zooming in and out on a picture just to see a detail (not to save the zoomed portion) in, for example: Microsoft Office picture manager or a similar picture viewer, does the picture lose quality over time?

Apologies if this is common knowledge, and thanks in advance!
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#2
Battle Unit

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if you don't modify the file (don't get "Save/Overwrite?" questions), nothing changes in your picture.
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#3
JoshBuckheimer

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As CelestialTeardrop said as long as you don't save or overwrite the image it wont change!
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#4
CelestialTeardrop

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Apologies for not replying sooner; thanks for your replies Battle Unit and Josh. I heard that rotating/flipping an image causes it to lose quality, so I became curious if zooming was the same way. :)
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#5
BlackHalo

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Hi CelestialTeardrop. Flipping, rotating and zooming an image does not cause it to lose quality at all, unless you save at it a lower quality than it was initially (ie lowering the dpi) or rotate/flip it manually (which can cause it to lose its correct proportions if done incorrectly). These three options in particular don't necessarily change anything in the image. Flipping and rotating use the existing info of the image and just applies it differently. Zooming (with the zoom tool, I don't mean enlarging) has no effect on an image whatsoever. For instance, in Photoshop you don't even have to rasterise a layer to zoom, flip or rotate, so no image loss takes place.
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