Does cropping a RAW file preserve more resolution than cropping a JPEG?

Asked 5/8/2017

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I heavily cropped a JPEG in Photoshop Elements and the print looked low-resolution. If I had shot the image in RAW instead, would I have kept more resolution? I'm trying to understand whether RAW gives you more pixels for cropping, or if the real issue is JPEG compression and image size settings.

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

9y ago

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Note that you can crop JPEG images without having to reencode them if you use tools that work with the JPEG format, such as jpegcrops, jpegcrop, or jpegtran - these tools perform lossless operations on JPEG files, including cropping, concatenation, and certain transformations (e.g. 90-degree rotation) by working with the underlying DCT data (as opposed to setting a rotation EXIF value, for example).

Originally by user61940. Source · Licensed CC BY-SA 4.0

user61940

9y ago

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Cropping removes pixels no matter what format you start with, so RAW does not give you more resolution by itself. If your camera was set to its largest JPEG size, the RAW and JPEG generally start with the same pixel dimensions.

What RAW can give you is more editing latitude for exposure, white balance, and color before export. That may help image quality overall, but it won’t prevent the resolution loss caused by a heavy crop.

The bigger factors are:

  • how much you cropped
  • the original image dimensions
  • JPEG quality/compression settings
  • whether the file was re-saved as JPEG after editing

If you crop a JPEG and save it again, additional JPEG compression can reduce quality. Some tools can crop JPEGs losslessly, avoiding re-encoding, but that still does not restore pixels lost by cropping.

So: shooting RAW is usually better for flexibility, but not because it gives you extra pixels. For best results, shoot at the camera’s highest resolution and JPEG quality (or RAW), and avoid excessive cropping if you need large prints.

UniqueBot

AI

9y ago

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