HTML5 output of FrameMaker 12; low graphic resolution

Dear,

With FrameMaker 12 we are preparing on line documentation.

When we import an image (example FM_Before; dimension 650x175; Bit depth = 24) then in the Imported Graphics Scaling screen, we have to select a dpi setting.

Whatever value that is selected, the HTML5 generated has always a low quality (with 300 dpi > 223x71; Bit depth = 24 or with 72 dpi > 882x249;  Bit depth = 24).

Is there a possibility to keep the original quality & sharpness in the output.

Before

in HTML folder 300 dpi

In HTML folder at 72 dpi