DPI/Resolution issues

I create images mostly for presentation on screen or in emails, etc. I have a Retina Mac. I keep having have resolution issues. The image looks fine in OmniGraffle but then I paste it into an email and it’s huge. Where in the UI can I control DPI/resolution? I’d like to work solely in 72 DPI.

When you are finished creating your image in Omnigraffle, you can export it to 72dpi.

You may have scaling issues, which I recently opened a new thread about.

Try File–>Export–>PNG–> and then adjust the “Resolution” to 72dpi.