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General photography questions and answers: Discuss 16Bit or 8Bit....Quick question........If only saving an image to show on the Web, is there any point in working in 16Bit? I ...
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Old 19-09-2007, 07:31   #1 (permalink)
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16Bit or 8Bit.

Quick question........If only saving an image to show on the Web, is there any point in working in 16Bit?

I always open my RAW files in CS as 16Bit even though they would only be shown on the Web and so finish up as 8Bit
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Old 19-09-2007, 07:39   #2 (permalink)
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Re: 16Bit or 8Bit.

But using that argument surely you'd then shoot JPEG? On a P&S Boots 2MP? Oh! You do use a Boots 2MP P&S

I guess there's an argument that the 16bit'll have some highlight detail which you can then emphasise so it'll remain when converted to 8bit
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Old 19-09-2007, 07:50   #3 (permalink)
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Re: 16Bit or 8Bit.

Quote:
Originally Posted by Markulous View Post
But using that argument surely you'd then shoot JPEG?
I always shoot RAW.....gives me more control over my errors

I will ignore the Boots comment

Quote:
Originally Posted by Markulous View Post
I guess there's an argument that the 16bit'll have some highlight detail which you can then emphasise so it'll remain when converted to 8bit
Good point.
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Old 19-09-2007, 08:52   #4 (permalink)
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Re: 16Bit or 8Bit.

Mmmm.... well.... IMO there's not much point in working in 16-bit unless you are stretching (part of) the tonal range - e.g. boosting shadows - or applying other effects where a smaller gap between each increment of tone is an advantage. The benefits are slightly greater in Adobe RGB colourspace than in sRGB because the same numeric values are spread over a slightly wider gamut (so the increments are larger), but for the web (and unless your image contains the extra colours which aren't visible on most monitors anyway) there's no need to use Adobe RGB and you have to convert to sRGB for the web.

And in 16-bit you end up with a 60MB file from a 10MP image.

Ramble....
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Old 19-09-2007, 08:54   #5 (permalink)
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Re: 16Bit or 8Bit.

Cheers Silky ....I always enjoy your rambles
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Old 19-09-2007, 12:27   #6 (permalink)
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Re: 16Bit or 8Bit.

Depends on your process not just the end output. Even if you were printing, you would probably end up with an 8 bit file for printing.

So if you started with RAW but made no adjustments in the RAW converter and did no subsequent editing then you may just as well use JPEG. On the other hand, if you make appropriate adjustments in the RAW converter then save as 16 bit then subsequently make further tonal adjustments in PS, you will certainly benefit from 16 bit whether you print or output to web.

I also shoot only in RAW and convert to 16 bit TIFF files and only finally convert to 8 bit for output (printing or web). Of course some files may need little adjustment so this may be over the top but, as I cannot tell in advance, I prefer to adopt the same process for all pics. I personally archive the RAW file (DNG now) and the final 8bit TIFF edited version in Adobe RGB (1998) profile at full size. If I need a version for web or commercial printing, I produce a temporary copy just for that purpose resizing, scaling, cropping and converting to a new profile as needed.
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Old 19-09-2007, 13:39   #7 (permalink)
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Re: 16Bit or 8Bit.

Am I the only one who works in PSD as an intermediate? I like to be able to save paths layers masks etc? Bigger files though but that's OK I only have 4 pictures that are keepers from the last 20 years anyway and 3 of those still need tweaking
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Old 19-09-2007, 14:06   #8 (permalink)
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Re: 16Bit or 8Bit.

No you are not the only one. I save most of my images once finally edited as an 8 bit single layer TIFF. However, during the editing process, I will save in PSD to ensure all mask, layers etc are intact. In cases where I use Duotone, I have to save the final version as PSD. Also in cases where I think I may want to change the image in future, I also save as PSD and retain layers/masks.

I can understand that you might wish to save all files with layers etc. in PSD. I enter competitions and there is often a time limit to the age of the photograph. Also I am also always more enthusiastic about the shots recently taken so I rarely go back to re-edit shots taken much over 12 months ago.
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Old 19-09-2007, 14:46   #9 (permalink)
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Re: 16Bit or 8Bit.

For color modes, I like the Raw/16 bit psd. to 8 bit jpeg to web route. Always saving the original and any tweeks as 16bit, copies are cheap. Now with IR I have to convert in DxO to tiff to open in ACR. DxO respects the camera white point and open in ACR with the tempeture at 0. But P-E,,you know that old rule, the bigger you are the harder you fall, as my storage gets massive, little pictures look,,,well, still little.
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Old 19-09-2007, 18:30   #10 (permalink)
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Re: 16Bit or 8Bit.

Although VP was discussing RAW vs JPEG here, I think the comments on "bits" are still valid :- http://www.pixalo.com/community/gene...html#post76366
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Old 20-09-2007, 07:00   #11 (permalink)
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Re: 16Bit or 8Bit.

Thanks for the input fellas
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