I am a huge fan of Skim’s auto-crop feature.
This unique feature really helps with looking at PDFs that exhibit generous 
margins.

However, it does not help with vertical whitespace internal to the page.
The most obvious case is double-spacing (incredibly, people still do that).
But also a page number at the end of a half-full page could be moved up.

So how would I do this?
1) group the features on the page into clusters of features, pairs of which 
share a common horizontal position.  Sort these clusters by vertical bounding 
box coordinates.
2) process the whitespace between the clusters (i.e., move the clusters) in 
some way, e.g. half it if it is more than 2 pt, with some logarithmic rule that 
squashes large whitespace some more, but still keeps it larger.

I don’t know enough about PDFkit etc. to program this myself (or even to find 
out if the pieces are in place to make this happen).

Grüße, Carsten


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