Image File Sizes

0-16k is great

16-40k is acceptable depending on the medium. A .jpg should never be over 60k (which is a tiny Flash movie)

Horizontal gradients take up more file size than vertical gradients

 

Resolution:

72dpi

Keep an unflattened, high resolution version of your image (a resource file, <.psd>) so you can make all changes to the original.Recompressing a <.jpg> causes artifacting.

 

Compression:

artifacting = when too much, or repeated compression, is applied and the image loses integrity; Sometimes called "the jaggies"

.gif, or a giff file = used when there are broad areas of flat color (spot color, Pantone colors, line art, etc.)

.jpg = used when the image is continuous tone (like a photograph. 4-color process--CMYK)

 

Common monitor area/Web page sizes:

640x480 pixels (everyone has a monitor at least this size)

800x600 pixels (most people can view this correctly)

1024 x 768 pixels (you're aiming your presentation at people who can afford big monitors, fast bandwidth, and have the technological knowhow.

TV is 640x480