What size/resolution logo for Maintain Report Formats?

Hi -

I need to change our logo on our internal reports (Through Maintain Report Formats) and the last time I did it we were worried about Y2K....

What are the recommended sizes in Pixels and/or Inches for the JPGs?? 

Our logo is approximately 1.4 in wide x .7 in high and I've tried all sorts of pixel counts and sizes and shrinking and not and found that no matter my selections, the AP reports and the AR reports always have different sized printed output with the SAME logo in the Report formats!!

We are now on V2014.2 (April 2014) and were probably on Acuity V4.1 when I put the old logo in....  (I've got no clue where a 17+ year old logo might be now to compare...

Thanks for any help.