Hi, I have not tried rendering in SWX '14, but in SWX '12 you get only 100 dpi image.
So, I was used to create an image with 100 dpi and much larger (3x or more) pixel resolution than actual requirement and then shrinking it using photoshop to increase dpi.
It is what I was thinking about but I cannot make a big enough screenshot to increase dpi (to meet the requirements for the width and resolution of the photo).
Please also be aware of Enhancement SPR 899964 - "Allow ultra high resolution export of Simulation result plot images with plot legend & details (e.g. to print large banner, etc.)"
If you would like to request this enhancement, please search for this SPR in the Customer Portal and select "Yes, but notify me when this is fixed (SPR only)".
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If this is urgent, please contact your SOLIDWORKS Value Added Reseller (VAR) to request additional assistance.