[xep-support] Table borders rendered with different size

[Bob Stayton]

Hi David,
The part I don't understand is when you have a table with horizontal cell
borders that are all specified exactly the same, then some cells *in the
same row* have different widths in Acrobat.  Presumably they all have the
same starting pixel location in the vertical direction in the pixel grid,
and the same pixel count, so they should all render at the same visible
width with each other, although not necessarily with the rest of the table.
It is the changing widths within each row that is most annoying.  Since
there is no way to specify a border on an fo:table row, there seems to be no
way to fix this particular problem.

Bob Stayton
Sagehill Enterprises
DocBook Consulting
bobs at sagehill.net


----- Original Message ----- 
From: "David Tolpin" <dvd at davidashen.net>
To: <xep-support at renderx.com>
Sent: Tuesday, February 22, 2005 4:29 AM
Subject: Re: [xep-support] Table borders rendered with different size


> > KJ> It doesn't matter if  I change the border size,
> > KJ> the phenomenon is still there.
> > KJ>
> > KJ> Is this a common  issue? I can send an example PDF if necessary.
> >
> > I would appreciate if you could send a sample fo and pdf offlist to
> > support at renderx.com.
> > Does the problem exist with 3.8.4?
>
> Hi,
>
> to fix this behavior, you'll need a display with higher resolution; for
> normal human eyes something about 300dpi will do; while your display is
> 100dpi at best. Consider a line 3.6 pixels wide. It will be 4 pixels
> wide if starts exactly at the beginning of  a pixel, but 3 pixels wide
> if it starts somewhere at 0.7 of a pixel and ends at 4.3: pixels at
> both ends are less than half black and will be painted white; Acrobat
> Reader does not antialias subpixels in lines.
>
> When you print the document, the line looks much better, because the
> printer resolution is significantly higher and the error is beyond the
> capacity of your sight.
>
> Of course, you may fine-tune all dimensions in a document so that all
> lines fall into the pixel grid at some resolution (or magnification),
> but then it will fall off the grid at other resolutions anyway.
>
> David Tolpin
>
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