Storing high quality images sucks up a large amount of disk space. To reduce this, so you can store more images, you can use a image optimizer. There are optimizers for both .gif and .jpg formats. (Probably others to, but these 2 formats are what I use)

The JPEG optimizer I like is The JPEG Wizard by Pegasus

The GIF optimizer I like is Trout's GIF Optimizer

To demonstrate the benefits of image optimization, below are 4 images of the same original. Note the quality and download speed of each.

Original image is:

• 1600 x 1200 Pixels
• 457.07 KB (468036 Bytes)
• Number of unique colors: 179966

• 1600 x 1200 Pixels
• 69.75 KB (71424 Bytes)
• Number of unique colors: 138431