Hi,
When using the tracking pixel you can’t track:
- search keywords (not sure about that)
- referrers
- screen resolutions, browser plugins, etc
- page titles
- clicks to external websites or downloads
But you can still track as with the Javascript tracker:
- IP-Address
- User Agent (Device, Browser, OS)
- visited URL
and everything that can be infered from this data.
From Tracking API - Analytics Platform - Piwik and
Unterschied zw. Javascript & Tracking-Pixel