> On 1 Sep 2020, at 14:13, Thomas Schneider via Skim-app-users > <skim-app-users@lists.sourceforge.net> wrote: > > There is a great program for marking up PDFs on an iPad called > GoodReader (https://goodreader.com/). > > GoodReader provides a way to write some text, put it in a box an have > a 'callout' arrow to point at things. This is very handy for > commenting on specific text. > > Unfortunately the box and arrow marks for 'callout' created by > GoodReader do not show up in Skim, Adobe Reader or macOS Preview. > > For example, recently another scientist sent me their paper and I > marked it up with suggestions and corrections. However, I had to > trace over the callout boxes by hand (which looked ugly!) because > otherwise they would not see what I was pointing to. > > I am writing to the Skim group in hopes that some of you smart people > can figure out why the callout graphics fails. Specifically, what is > wrong with the PDF that GoodReader creates? Maybe GoodReader folks > can then fix their code. (Note: I'm assuming that the other readers > do the right thing and that the problem is with GoodReader.) > > Here are files that demonstate the problem: > > calloutdemo.tex - the LaTeX file I used to create the PDF. > > calloutdemo.pdf - PDF created from calloutdemo.tex > > markedcalloutdemo.pdf - the PDF marked by GoodReader in which I added > a callout box with the words: 'Here is a callout box pointing to the > word "Why".' When viewed with Skim the words have a box around them > and an arrow. > > markedcalloutdemo.png - a PNG captured from the iPad that demonstrates > the callout box and arrow. > > Tom
It looks like they just invented their own extension to the PDF format. In other words, these extra elements aren’t part of the PDF specifications. So only they will understand them. Christiaan
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