pages I hope to give you a little insight into image resolution. From
scanning to digital cameras to printing to JPG files for the web. The
first example is a comparison of scanning at different resolutions.
With the new scanners on the market at under $100 offering optical resolutions
of 1200 x 600 ppi resolution, what resolution do you need for publishing
your images on the web. 72ppi
Thats right, 72 pixels per inch is all a computer monitor can display.
What I believed was scanning at 72 ppi saved time and created a better
image than scanning at a higher resolution and re-sizing it in my imaging
What I found was , to some degree, surprising. The difference in
scan time at 72 ppi and 300 ppi did not exist. The reason for this
is that the scanner always scans at its optical resolution so that
at 72ppi its still scanning at 300 ppi and throwing away the extra
The difference in the images was indistinguisable until you enlarged
the images. So take a look at the following page and see for yourself.
The third small image is the same image as the large image on the
page. If you right click on the three small images and select "properties"
you can see the image sizes. You'll notice the primary difference
is in image size and not in what you can see on screen.
The primary advantage to scanning at 300ppi is that if you plan to
print your images in color on an inkjet printer all you have to do
is scan once and resize in your image editor for your web images.
If you plan on printing your images be certain to see the section
on "The effect of scan resolution on printing".
The second page gives you an idea on how compression ratios in the
JPG format affect your image size (thus load time) as well as the
overall image resolution (detail). JPG is a lossy format.
For this reason, any time you scan a photo, or capture a digital image
from a camera, save that image first in a non-lossy format ( i.e.
BMP or TIF) and do all your editing to that base image. Do not (DO
NOT) save over that image or the changes will be permanent.
So take a look a the next page and see how changing the compression
ratio when saving in a JPG format affects image quality and load time.
What you will find is that to get you pages to load in a timely manner
you will have to limit the number of images on a page and sacrifice
some image quality (it does not have to be perceptible to the nake
eye) to keep your overall page size down. And for folks with graphics
rich pages(you know who you are) or people with music ( large files)
this all adds to load time. So clear out all the extraneous junk (cutesy
animations, etc) and stick with the stuff you really want people to
see. Excessive load times drive away surfers faster than anything
So you're already to get your images ready for the web. The two common
formats are JPG and GIF. Which one is right for your images? Look at
these quick comparisons and you'll know immediately which ones to use. Page 4 - What file format should I use?
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