On the old report templates (used on everything except the new style Demographic and Income report), a height of 200 pixels is about as tall as you can go. You can probably go a little wider than 200 pixels on the width.
I have several different logos for the reports that are 200px tall...if someone runs a 'new style' demographic/income report the logos come out huge and overlapping the text of the report. Is there a new standard for this new style of report logo?...will the 'old style' reports be upgraded to the 'new style' so I can just use one size of logo?
For best fit, the size of the logo image should be 450 x 200 or less. To correct the overlapping issue, you might choose the �??Shrink to fit�?� option when uploading your custom logo. Yes, there is a plan to update all reports to the new style, so you should be able to use one size logo for all reports.