Themeroller icon color washed out (too light)

Themeroller icon color washed out (too light)

I have been using JQUI for a while and have a few custom Themeroller templates in use. I wanted to upgrade a theme to JQUI 1.9.2 and went to my 1.9.1's themeroller URL.

The problem I have noticed is that the icon colors seem washed out. I have chose a dark purple color in the default state icon field (#252669), but the color that comes out is much lighter (#6A6BAA). I have attached a screenshot with the colors side by side to illustrate.

Has some new option been introduced in themeroller or something? It's as if there is a layer over the top that is lightening the color. The actual png file that themeroller creates has the correct color value #252669.

I'm probably being stupid, but any suggestions as to why this is and how I can fix it are welcome. Thanks!