[Poppler-bugs] [Bug 37347] A pdf with a grid of thin lines is almost unreadable and looks awful

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=37347

--- Comment #26 from thomasf <Thomas.Freitag at alfa.de> 2012-05-26 07:48:44 PDT ---
(In reply to comment #25)
> ISO32000 page 319: 
> "If stroke adjustment is enabled and the requested line width, transformed into
> device space, is less than half a
> pixel, the stroke shall be rendered as a single-pixel line."
> 
> It looks to me like stroke adjust does both.

You speak about the PDF spec, I speak about the xpdf introduce of stroke
adjust:

Implemented stroke adjustment (always enabled by default, ignoring the SA
parameter, to match Adobe's behavior), and added the strokeAdjust
xpdfrc command.

And I agree with arguement of xpdf: it seems as if acrobat reader ignores the
stroke adjust parameter SA, but have the preference "enhance thin lines".
Please have a look at the PDF of this call with acrobat reader and change this
preference. You'll see a comparable output tp comment 19 and comment 22, either
You switch it on or off, and if has nothing to do if You change the SA
parameter in the PDF itself.

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