[Framers] FrameMaker 12 - RoboHelp 11 - Graphics Conversion shows bad results

[thomas.zeisig at xcerra.com]

We are using TCS 5 and encounter blurry graphics when we convert a 
FrameMaker book to HTML Help.
All graphics are referenced in the FrameMaker files and are mainly Tiffs 
with  632x475 px at 200 dpi.
Due to our layout we want to become the graphics in the on-line help 
enlarged to 200 %.
It seems that RoboHelp converts the graphics in two stages, in the first 
stage  the graphics will be resized to 96 dpi, 303x228 px. 
In the second stage this 96 dpi graphic is then scaled to 200% which 
results in bad image quality.
Is there any way to change this conversion behaviour?
If I resize such a tiff in Photoshop I get perfect quality, but it is a 
one stage conversion.
BTW: We tested RoboHelp 2015 too, with the same result. 
 
Best Regards  - Thomas Zeisig