GIF and JPG
GIF
- An acronym for Graphics Interchange Format, created originally in 1987
by CompuServe to facilitate the exchange of images between different platforms.
The file format is known for its compression and the fact that it can store
and display multiple images. The major drawback to GIF is that images can
only use up to 256 distinct colors to display their data. For photographic-quality
images, this is a significant obstacle.
Choose the GIF format for:
Images
with a transparent background
Animated
graphics
Smaller,
less complex images requiring no more than 256 colors
JPG - Developed by the Joint Photographic Experts Group, this file
format is the Internet standard for presenting photo realistic images. It
has the capability to compress large images down to very small file sizes
while retaining the overall photographic quality of the image. JPEG files
can use any number of colors, so it's a very convenient format for 24-bit
images (True Color, which supports more than 16 million colors).
Choose the JPG format for:
Photographs
Larger,
more complex images requiring more than 256 to display properly
Graphics Image
Compression
Balancing
quality against download speed is a constant concern when designing a web
page and all the graphics for it. In the case of web graphics, less is definitely
more. Some files can actually be much smaller using compression in the JPG
format and result in a better looking graphic. The best of both worlds.
While using the GIF format generally creates a smaller file for faster
download, that is not always the case!
What I usually do is create the image I like in Paint Shop Pro from Corel.com, for example, using the default file setting of 16 million
colors. (This allows for far more image design and effects possibilities
while you are designing, too.) If I do not need the image to be transparent,
I will play around with my compression options before saving, or exporting,
the file to see which format gives me the highest quality at the lowest
file size. Sometimes JPG files can be smaller than GIFS.
The only online graphics compression utilities that I have found are for
GIFs only. GIFBot
is an excellent one to try .
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