Description of problem:
1) Create a book incorporating an image with a width of 660px and a DPI of 110.
2) Set max_image_width to 660 in publican.cfg
3) Build html output. The image will appear as 660px.
4) Change the brand to RedHat in publican.cfg
5) Build html output. The image will have a width="444" attribute added.
Version-Release number of selected component (if applicable):
Publican 2.5, on F14
660px image works in RedHat brand
Restriction removed in version 2.7
Working for me, locally and on doc stage