For years I have suffered thru an absence of ‘pixel rulers’ in Visio.
I understand that a pixel is a screen concept, of different dimensions on various display screens… not going into that here. However, I frequently use Visio to construct various image files to fit into an exact space – and resort to using a 2nd program to finally scale my image file to the exact fit ( in units of pixels).
Apparently, in 2008 Noah posted on his blog (ComplexDiagrams.com) an article describing how to deal with this. Unfortunately it was years and years later before I found it (in 2014). But I did, and it works for me, and I will use it often.
A screen shot and quick explanation from Noah :
Why it works Picas are 6 to the inch. By setting the ratio at 1:16, Visio presents a diagram at 96 picas per inch, the same as the Windows standard of 96 pixels per inch. You could set an appropriate ratio with any of the available units, but it works well with picas, and I find it useful that all units are labeled as p.
Thanks Noah ..!.. /;^)