Clearing the Swatch Cache
Swatch images are resized and cached before they are used. Swatch images are stored on the
server in the Magento installation directory, at the following location:
[Magento install directory]/media/catalog/swatches/
Whenever changes are made to existing swatch images, the swatch cache must be flushed
before the changes can be seen in the store.
To flush the swatch cache:
1. On the Admin menu, select System > Cache Management.
2. In the Additional Cache Management Section, click the Flush Swatch Images Cache button.