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Processing Raw Images Question
Old 10-09-2004, 12:38 PM   #1 (permalink)
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Is there any benefit to exporting a 16 bit tif over an 8 bit tiff? What does a 16 bit tif have over the 8 bit?

Any info would be appreciated.

Thanks,
James
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Re: Processing Raw Images Question
Old 10-09-2004, 12:53 PM   #2 (permalink)
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From what I've been able to discover, (IMHO) the only advantage to 16 bit is in the initial processing for colour (grey bal & any colour cast, contrast and sharpening. Once those are done I convert to 8bit to save drive space and memory. I always keep the origial and may keep the corrected 16 bit image.

My workflow goes from RAW to Capture One pro to generate a tif, then to photoshop for final processing. I found that the C1 software speeds up my productivity and reduces most of what I need to do in PS. Just wish I could fix my images on here so they look the same as on my monitor!!! LOL

I'd be interested if anyone has other views on the C1 software or the 8/16 bit question. [img]/ubbthreads/images/graemlins/smile.gif[/img]

Roger

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Re: Processing Raw Images Question
Old 10-09-2004, 01:09 PM   #3 (permalink)
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there's much more information on a 16bit image vs. an 8 bit. however, working with 16 bit images can be difficult in PS. not all of the filters and stuff work with 16 bit.
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Re: Processing Raw Images Question
Old 10-09-2004, 01:31 PM   #4 (permalink)
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Stay 16-bit as long as possible...then convert to 8-bit. There is quite a bit more color data to work with in the 16-bit file so Photoshop doesn't have to extrapolate as much.

John [img]/ubbthreads/images/graemlins/cool.gif[/img]

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Re: Processing Raw Images Question
Old 10-09-2004, 05:27 PM   #5 (permalink)
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Mathematically, 8 bits (for those who don't know binary) is 256 (including zero). That means 256 colors. 16-bits doesn't mean twice as many colors simply because binary is not counted the same as decimal. 16 bits is actually equal to 65536 (including zero). You would typically have heard of these as 255 colors and 65535 colors because zero is not counted. Nevertheless, you can see just from the pure mathematics that 16-bit contains significantly more information; approximately 257 TIMES as much information. And so, I guess it just behooves us to use 16-bit as long as possible before we have to convert. It's a crying shame we have to convert in the first place. Such is life.

Good day.

My name is Mike Larsen and I approved this message.
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Thanks, everyone
Old 10-09-2004, 09:05 PM   #6 (permalink)
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especially, Mike...lots of good info. It sucks that 16 bit doesn't work with everything...thanks for the info guys...

James
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