Image Spam is hard to filter, but the anti-Spam vendors are working on it using OCR to read what's in the images. That's why the image is so "noisy," it's to try to evade the OCR systems. The random noise added around the edge is deliberately random so the anti-Spam vendors can't arbitrarily block just a single image. Don't
open any Spam if you can help it.
A great deal of the Spam you get is sent by
infected home computers participating in a botnet. So if you have clueless gf/mom/siblings, check their systems for
current-generation antivirus software (not some relic from 2 years ago), a firewall, and patching. Here are some online checkup tools (use Internet Explorer, since these are ActiveX-based tools):
If they have old antivirus software and you need some free stuff,
AntiVir was probably the best free one until
AOL Kaspersky came out. If you use AOL Kaspersky, leave off the optional security toolbar. Make sure to schedule scans, and go through the Settings panel to configure it.