You can maintain the picture quality when you insert images at various positions in both structured and unstructured documents. FrameMaker maintains the image resolution even when you fit an image that is larger than the size of the anchored frame.
To scale the image automatically, do the following:

This feature scales the image proportionally to fit into its parent anchored frame while maintaining the best possible DPI.
You can use this option to scale your images when you insert them both in structured (DITA 1.2 or 1.3) and unstructured documents at the following positions:
@height, @width, and @scale attributes
defined for the image.To support this functionality a new property AutoScaleImageAlongWidth has
been added in the maker.ini file in place of
the AutoScaleImageInTableCell property. To know
more see, Adobe FrameMaker INI Reference.