On 1 February 2012 02:37, Larry Colen <l...@red4est.com> wrote:
>
> On Jan 31, 2012, at 5:07 PM, Mark Roberts wrote:
>
>> Larry Colen wrote:
>>
>>> Mark,
>>>
>>> I can't do a K-5 photo at full resolution 100% JPEG quality and fit the
>>> maximum file size for submitting to the annual.
>>> That means I need to either make it smaller in pixels, or compress it more
>>> in JPEG quality.
>>>
>>> I could do full resolution at about 80% quality or about 3200x2800 at 100%
>>> quality. Which works better for you?
>>
>> I'd go for full-res at 80%.
>
> Interesting. Being ever so slightly aspy, or OCD, or an engineer, I had to
> find the best JPEG quality for each photo that met the size requirements.
> It turns out that at some point, there is a huge, nonlinear drop, from just
> over 4.4 MB, to way under. The changes seem to happen at 91% and 84%:
>
>
> 2.7M 20110406-LRC04748_91.jpg
> 4.5M 20110406-LRC04748_92.jpg
> 3.5M 20110617-IMGP5637_80.jpg
> 3.5M 20110617-IMGP5637_82.jpg
> 3.5M 20110617-IMGP5637_83.jpg
> 5.1M 20110617-IMGP5637_85.jpg
> 5.1M 20110617-IMGP5637_89.jpg
> 5.1M road_sofa_90.jpg
> 5.1M 20110617-IMGP5637_91.jpg
> 7.2M 20110617-IMGP5637_92.jpg
> 2.3M 20111227-LRC33316_91.jpg
> 4.7M 20111227-LRC33316_92.jpg
>
> 2.3M moonshine_91.jpg
> 2.7M one_eyed_jack_91.jpg
> 3.5M road_sofa_84.jpg
Larry,
When I first started using Photoshop in 2005 I took one of my photos
with plenty of detail and colours and saved it as a JPEG in all
quality settings up to 12. I then pixel-peeped the hell out of them
and came to the conclusion that the differences between 10 and 12 were
as good as invisible but the file sizes were VERY different. The
difference between 8 and 10 was small, but visible to me at 100%. That
was the last time (and first) I performed this test and since then
have saved JPEGs at quality level 9 or 10, and sleept soundly at
night.
Cheers,
—M.
\/\/o/\/\ --> http://WorldOfMiserere.com
http://EnticingTheLight.com
A Quest for Photographic Enlightenment
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