DPI and Why - Resolution Does Matter

When I first started on the internet I was athem as 5x7 inch size. My new site
photographer and a science fiction fan. Since I did(betterphototips.com) looked very impressive and
nothave any science fiction photos of my own, Iactually loaded very quickly. Yes, I also eventually
started surfing the web. After several months ofstepped up to real high speed (1.5mbs per sec.) Life
looking through a large variety of Sci-Fi web sites, Iwas good; until I went back and started pursuingone of
realized that most of the sites that had any quantitymy other great loves (writing). I figured rather than just
ofphotos put them up with very small thumb nail sizeusing this site as a gigantic portfolio;why didn't I offer
prints (usually 1 inch x 1 ¼ inch or smaller). Keepinsomething for sale as well. You know the old adage
mind that this was in the days that a 28.8 modem was"write about what you knowbest"? To me it made
considered high speed. (Ha, ha)perfect sense that I should write about photography.
The reason these thumb nails were so small was thatThat's when things startedto get complicated.
it took so much time for the pictures to comeup on theWhen I started looking around at self publishing and
page. When you clicked on an individual thumb nail; aprint on demand publishing, I found that theyall wanted
larger version of the picture cameup (usually 4x6 orthe pictures to be 300dpi or greater. This was a total
bigger), but it would take a long time to do so. I wasshock to me. I had thousands ofimages that I was all
just learning the web and Idid have access toready to use, but they were all saved at 72dpi. I
Photoshop.thought that Photoshop couldsave me again, so I
What I did was search through all the big shots; savedstarted converting them to 300dpi but something didn't
the ones I liked, and then brought them into Photoshoplook right. It made nosense to me at the time, but my
where I could compress them. I then made my own300dpi images looked worse than my 72dpi images. I
site with images that looked as sharpor better than thewas at a loss.
original; but my pictures were 2 inch x 2 ½Then I went back and did my research.
inches, much better than all the reallysmall thumb nailThe reason the images on the CD's that come from
shots I saw every where else. Through all mythe lab are so huge (in measurement) is so youcould
searching I found that over 90% of the images I wasuse the images in either format. 72dpi is exactly 25%
finding were saved at 72dpi; so that's what I did. Forof 300dpi. If you want your 300dpi imagesto look as
several years, I saved all myphotos at 2 inch x 2razor sharp as your 72dpi images do on line, the print
½ inches and at 72dpi.has to be 75% smaller. In otherwords, an image that
As my interest in photography continued to grow; Imeasures 44 inch x 56 inch at 72dpi would be the
realized that a Sci-Fi web site might be cool butit madesame quality as an imagethat measures 11 inch x 14
me no money. I needed to put up a web site of myinch at 300dpi.
own photos. By now I was using a 56kmodem andIf you take an image that was originally 5x7 inches at
decided my pictures needed to be bigger. When I72dpi and just try to convert it directly to 300dpiat the
scanned in my pictures I usually didthem at 100% atsame size, it will not turn out very well. Similar to the
72dpi; so that all my images on line where now 4x6 inequivalent of the right f-stop and the right shutter
size.speed, you have to take both factors into account! DPI
After a few years my lab started offering pictures onand Size are forever tied together. Youcan not
CD. They were also 72dpi so I didn't have toscanchange one without affecting the other. It is much
them in anymore. Life was good. They put images ateasier to make something smaller that looks good,
these huge file sizes like 44 inches x 56inches which Ithan to try to enlarge something after the fact and try
really couldn't figure out. I didn't know of anyone whoto make it look even close to the original. The moral of
would ever print something thatbig; so again I tookthe story is; ALWAYS save your images larger then
those images and compressed them down to 4x6you expect to use. Do not waste 15 years of your life
inch size.and thousands upon thousands of images that can
Eventually, I started doing the same thing but savingonly be used in one way. Always save large!!