I'd say it does not make much of an indication as to were the problem is. But
it does show where the problem is not. And that is in Skim itself. The text is
displayed by PDFKit. The only thing that we do is change the image
interpolation, which should not affect the font rendering and apparently also
doesn't. Everything else is pure PDFKit.
And as it seems to be sensitive to layout of the window and redisplaying on
changes to the layout, this really only points to PDFKit, as it should not
depend on such things. Because, again, we are not involved in the rendering.
Because of that, I really don't see how we could fix anything here, Apple
really needs to fix this.
As for the actual size, in Mac OSX the standard is to interpret 100% as 1pt
mapping to 1px. And we call that actual size. In Preview you can also choose it
to map to 1/72in, which is the printed page standard, but it depends on a pref
setting. We call that physical size, with shortcut Opt-Cmd-0.
Christiaan
On Oct 21, 2014, at 19:22, Hooman Javidnia wrote:
> I can see this effect on my MacBook Pro with non-retina display. Comparing
> the same PDF file in Preview and Skim, Preview renders a smoother output.
>
> One more thing that I have noticed is the difference in "Actual Size" zoom
> setting between Preview and Skim. Whereas Preview opens a page with the size
> of actual document, pressing cmd-0 generates a page that is smaller than the
> actual size of paper. Could it be related to retina vs non-retina displays?
>
> Hooman
>
> —
> Sent from Mailbox
>
>
> On Tue, Oct 21, 2014 at 11:19 AM, Ivan Werning <iwern...@gmail.com> wrote:
>
> PS: a final appendum to my point 2b Perhaps a detail:
>
> I just noticed that if you have View set to Automatically Resize and you open
> a PDF file, then it first renders as in "Larger". If you then "jiggle" the
> window size, ever so slightly, it immediately switches to a rendering as in
> "Smaller". In other words, its first rendering is still as in the case where
> the window is larger than the displayed PDF.
>
> Please let me know if my screen shots are good enough to appreciate these
> things. I took a shot of the window, rather than a box or the screen. Perhaps
> I should have taken the entire screen to keep the shot the same size when I
> changed the window size.
>
> -Ivan
>
> On Tue, Oct 21, 2014 at 11:08 AM, Ivan Werning <iwern...@gmail.com> wrote:
>
>
> Follow the Hidden Preferences link, then go to Image Smoothing
> (SKImageInterpolation).
>
> Christiaan
>
> I poked around. I have two things to report.
>
> 1. Playing around with that hidden option did not improve things. I tried
> options 0 1 2 3 and noticed no improvement: it always rendered sub optimally.
>
> 2. I have noticed something interesting. The rendering depends crucially not
> just on the zoom level, but also, for a given zoom level, on whether the
> window is sized large enough to get the background color in the window,
> outside the PDF page I mean. that is, the grey region in Skim. In
> particular,
>
> a. for a given zoom level if I resize my window the rendering suddenly shifts
> when I go to a width that is larger than the page to one that is smaller.
> Larger:
> https://www.dropbox.com/s/a5458jwhwtn1ngu/Screenshot%202014-10-21%2010.57.39.png?dl=0
> Smaller:
> https://www.dropbox.com/s/8hsk3xpohdx5iqi/Screenshot%202014-10-21%2010.58.07.png?dl=0
> as you can see all I did was use my cursor to reduce the width from the right
> side of the window. The PDF displayed page did not move nor was it resized.
> But the rendering did change significantly.
>
> To be honest, both seem off to me, but the one where the window is smaller
> than the page looks better---perhaps even how it should/used to be, I am not
> sure really (still different than Preview). But the one where the window is
> larger than the PDF looks really blurry (as in low contrast) and blocky.
> Regardless, there is definitely a discrete change in the way things are
> rendering as one moves the window size as described.
>
> b. The same change happens if I click on "Automatically Resize". If I know
> change the size of the window I always get a rendering that I believe is
> identical (or at least very similar) to the "Smaller" above.
>
> I hope this clue might help find where the issue is.
>
> -Ivan
>
>
>
>
>
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