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The ability to format the image for the export process from Tableau Desktop is not currently built into the product. I was able to find a Tableau Community IDEA which I believe captures the desired results for the feature request. https://community.tableau.com/ideas/1118
Adding your vote to the idea helps show support for the feature. The Tableau Product Management team reviews the Tableau Community Ideas when creating the road map for the next product release.
I hope this helps!