Inconsistent opacity within highlight

warwickmm · March 24, 2023

When highlighting math equations, the highlight sometimes looks like it is composed of several regions (even though it is a single highlight). Where the regions appear to overlap, the highlight is darker, looking as if those regions were highlighted twice.

See the below example in zotero (6.0.23) vs. evince:

zotero: https://postimg.cc/N2KxwJwz
evince: https://postimg.cc/KRg5qHfK

The iOS app also exhibits the same problem.

dstillman · March 27, 2023

Can you provide a link to a PDF where you're seeing this?

warwickmm · March 27, 2023

The first two equations (7.1) and (7.2) of the below document illustrate the problem (although less drastic than the above screenshots):

https://archive.siam.org/books/cs22/cs22ch7.pdf

See https://postimg.cc/kB8zX44v

warwickmm · March 27, 2023

Here's a second example if it helps. The equation in Definition 1 on page 2 of the below PDF:

https://dl.acm.org/doi/pdf/10.5555/1953048.2185803

See https://postimg.cc/940XRTs7

martynas_b · March 27, 2023

We are aware of the issue. But I would recommend to use the "area" annotation tool since the text extracted from a formula won't be readable anyway.