What Miserere said. Also, there was a quantitative study published on the Web somewhere in 2010, after which I set the LightRoom export quality slider to 75 and have left it there. -T
On Thu, Feb 2, 2012 at 11:55 AM, Miserere <miser...@gmail.com> wrote: > > 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 > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
