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I'm playing around with Apple sips command. When I export a Canon raw file (CR2) to tiff via

sips -s format tiff -out img.tiff img.cr2

the result is an 8-bit tiff, although the CR2 source is reported as a 16-bit format.

How can I tell sips to export 16-bit tiffs?

ps: I have played with the --formatOptions option and with some of the image properties (particularly bitsPerSample), but nothing seems to allow for adjustment of the output bit depth.

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Does sips actually ever output 16bpp with other formats? Can you take an LZW tif and convert it to Packbits and retain 16bpp for example? –  James Snell May 13 '13 at 12:16
    
@JamesSnell Well, I assume Apple's Aperture uses the same engine as sips - and Aperture can export 16-bit tiffs. –  halloleo May 15 '13 at 15:48
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