unreadable .tif files unless saved via iPhoto

Problems with Windows/Mac OS, Photoshop or Twain hosted programs

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unreadable .tif files unless saved via iPhoto

Postby ericpmoss » Fri Apr 01, 2011 5:23 pm

I'm running the Ai Suite 6.6.2r4a on the latest Snow Leopard.

My workflow is to scan a slide or negative and save it as 64bit HDRi. Then I open the HDRi, process it and save it as 48bit color (or 16bit B+W) .tif file. The type of processing I do seems irrelevant, but is usually just color correction, application of GANE, and maybe a little cropping.

In either case, I can view the result in Preview and can import it into iPhoto. However, I cannot share the photo with non-Mac systems, whether by Share-ing from the iPhoto menu or by simply transferring the .tif file. What the non-Mac recipient sees is a banded, repeated fragment of the image's R, G and B channels.

If I do *anything* to the .tif file in iPhoto and re-save it, the resulting file is usable on Windows boxes.

Does anyone else have this issue? Is iPhoto limiting the color to 8 bits/channel and making the file compatible with non-Macs? Is there a fix that doesn't require me to import into iPhoto and re-save?

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Re: unreadable .tif files unless saved via iPhoto

Postby LSI_Ketelhohn » Tue Apr 05, 2011 7:53 am

Dear ericpmoss,

please be aware that standard Windows image viewers can not display 48/16 bit images.
On a windows system you need a professional Imaging software like SilverFast HDR (Studio) or Photoshop to work with 48bit images.

If you generally want to be able to view the images with all viewers you need to convert to 24/8 bit.

kind regards,
Arne Ketelhohn.

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