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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

1 Answer 1

if you look in the sips-Manpage there is no way to force exporting of 8 or 16 bit.

That's the answer: there is no way to do this with sips.

Is there any reason for using sips, instead of Lightroom or Aperture, which have great batch modes too?

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Well I wanted to use sips, because I guess it is the same engine preview uses to display the images - just for consistency... –  halloleo Aug 6 at 13:33
    
As far as i know, there schoud be no differenz between sips/apature/Lightroom-tiff Images. –  chris Aug 6 at 13:39
    
Well, there is a difference when you generate the TIFFs from Canon Raw (CR2) files, as mentioned in the question. –  halloleo Aug 8 at 1:24
    
do you can see the differens between an 8 and a 16bit tif? im realy impressed. But your problem was consistency, so if you convert all you pictures to 8 or 16bit tif they will have the same look at ever computer. –  chris Aug 8 at 6:14

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