Pixel density (dpi) settings are utterly meaningless to web display, they only matter for printing where you have both a physical print size and a set resolution (the 1200x800 part) as the combination of the resolution and the dpi settings combine to produce the physical print size. For online display only the resolution (1200x800) matters, the dpi setting is ignored. Monitors are around 100 ppi (pixels per inch) for the most part these days so that aspect is fixed. ppi is to monitors what dpi is to prints.
PNG should be used for web graphics, JPEG for photographs. The big files look better because they have less compression. More compression tends to add artifacts (ugly patterns not in the original image) and remove detail so bigger looks better but loads slower. -Adam On Sun, Aug 15, 2010 at 5:09 PM, Ann Sanfedele <ann...@nyc.rr.com> wrote: > Is there any point to display an image on line at 300 PPI as opposed to 72 > (or 96) with the same outside dimensions of, say > 1200 x 800 ? Or as .png as opposed to jpg ? > > "someone" told me once that the human eye can't see any more detail on a > screen than 72 ppi anyway and since it loads faster, > one need not make images larger... > > Yet it seems to me that some images you guys pointing to 1 mg to 3 mg files > on line do look "better"... on my LCD monitor... > > Has something changed with the technology so that one can tell the > difference now as opposed to say 3 or 4 years ago? > > My eyes are so shot i know it doesnt matter, but it does matter that others > see my stuff at it's best under certain circumstances. > > I've avoided asking you guys this for awhile cause it makes me feel > inadequate not to know -- :-) > > Almost all the files I send to smugmug are 300 ppi/dpi and 12 inches across > - and a few mgs... but I don't know if > the site translates them to show them on my site at a lesser resolution. > > ann > annsan.smugmug.com > > > > > -- > 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. > -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- 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.
