You may not
be a techie... But if you want to publish on the Internet, you need
to understand a little about digital images.
can come from many sources: digital cameras, scanners, the Internet, and
photo CDs. But no matter where you get a digital image, the most important
question is: Where is this photo going? To an email?
the Web? Or printed out for the fridge...
How you share a photo
determines how you should prepare it. Anyone who's had their email clog while
receiving a digital picture knows
the result of someone who'd sent an original, high definition photo, attached to an email. The same principle applies to photos on the Web. Too large a photo can stall the page when it is trying to load in the browser window. Not to mention, I have only a limited amount of space on the web server (the computer in Texas that hosts my Sylvia Lake website). I have to be reasonable in what I can post.
The Technical Stuff
A pixel is a
dot of color in a digital image. Digital cameras these days take MEGA pixel
images, in other words, pictures with lots and lots of dots
which make the picture sharp and clear. But the more pixels, the bigger
the size of the digital picture. In this context, "size" doesn't refer
to the printed size. It refers to the size of the file the picture creates.
always seems like a better idea- more pixels, more resolution. And if
you are planning to print a photo, more IS better. Always shoot pictures
at high resolution, with lots of pixels. If you start at a high resolution
you can always make the resolution lower. You can't do the reverse and
make a low resolution picture clearer.
The size of
the picture file is directly related to resolution (clarity) of the photo.
More pixels are best
for printing, but not for being seen on a computer. Computer screens are
only capable of displaying pictures about 72/76 dots per inch (dpi). A
picture that is 600 dpi won't look a lot different than one that is 72
element for displaying pictures from the web is the file size. If you are
going to display the picture on the Internet or send it by email, you have
to make your picture smaller in file size. So for pictures on the Internet,
more dots isn't worth the large file size. The pictures are too big to
display quickly. For the Internet, more (in terms of resolution) isn't
So how do
you prepare photos to send to this website or post to the Google Group?
and scanners come with software that allows you to edit your pictures.
But these programs are often difficult to use. If you have an Apple computer,
a Macintosh with OS 10.x, iPhoto came
with your computer. Other PCs running Windows also have photo editing
software. There are even online applications you can use... Google's photo editing software Picassa (for both Macs and Windows computers) is a good example.