determines which format you will use. The larger files use complex palettes and will
render a truer image. The smaller files use fewer colors and and less image detail:
- image .tiff-----105K
Bitmap images use a grid ( the bitmap or
raster) of small squares known as pixels to represent images.
Each pixel is assigned a specific location
and color value. When you edit an image, you are editing pixels tather than the object or
A bitmap image is resolution-dependent: it
contains a fixed number of pixels to represent its image data.Therefore, an image may
become corrupted after indiscreet manipulation since each pixel will contain different or
The images to the right were scanned at 400
dpi on an HP scanner. They were saved in different formats. Images on the web can only be
displayed at a resolution of 72 dpi so there is no need for a high resolution scan. The
rule for scanning is
-----scan at a resolution twice the output
In this case a scan of 150 dpi would have
Web images are designed for the web and not
for print. The low 72 dpi is far below the normal 400 - 600 dpi for a printed image.
When saving an image from the web, you can
crop, resize, change contrast, change color. YOU CAN NOT CHANGE THE RESOLUTION TO A HIGHER
NUMBER. You can save the image at a lower resolution. Start with a good image and you will
be happier with the results.
A general rule for embedded images is to
keep the files as small as possible. A large file takes longer to load than a small
(3K file). Therefore, you want to save the image in the smallest file format.
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