Inconsistent opacity within highlight

warwickmm

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

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

warwickmm

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

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

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.

b0c5

What is the "area" annotation tool ? I don't see it. Is this a Zotero 7 feature?

Also, related: https://forums.zotero.org/discussion/110523/overlapping-highlight-annotations-look-darker

adamsmith

The select area tool has been around since the start of the PDF reader -- it's the square with the + sign, but it's only relevant for this issue, specifically (because annotating formulas won't work to extract the annotated text anyway), not for yours, which is about annotating regular text.

b0c5

Ah okay. This "select area tool" creates only a rectangle border. It does not highlight (because the rectangle interior is not colored).

dstillman

It creates an image annotation.