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Re: [Swftools-common] How to keep hairlines visible?

From: Hans J Nuecke
Subject: Re: [Swftools-common] How to keep hairlines visible?
Date: Sat, 04 Jan 2014 01:29:30 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0

Quick update:
I probably choose the wrong approach, trying to increase the settings for zoom and jpeg (quality). A lower value for zoom helps to make hairlines visible. But because of interpolation and rounding there's always risk a line disappears. so best is to avoid hairlines, increase the input quality, optimize the design.

Nevertheless: if anybody knows about an option that could do similar things with swftools as it is possible with the "hairline correction" function of e.g. Acrobat PRO or Preflight , I'd like to know.


Am 02.01.2014 01:51, schrieb Hans J Nuecke:
I have a question regarding a special "issue" with hairlines:
In case the original document is not available and also Acrobat PRO is not an option... Is there a way to assure hairlines are converted and kept in the resulting SWF file after a pdf2swf conversion? I.e. set the width of lines to a minimal value of e.g. 1px?

I tried different settings of parameters like caplinewidth, multiply, minlinewidth and the quality values.
With no real convincing results.
Also poly2bitmap or bitmap did not help.

Background info:
Hairlines, i.e. lines of a width > 1px, can be problematic in a PDF.
Those lines can disappear in the converted SWF file or later when showing the SWF file on a monitor. I assume also due to rounding errors.

Such hairlines can be the result of a downscale of thin lines.

Adobe Acrobat Pro (like probably other tools) can correct such problems in setting the line width of lines thinner than a threshhold value to a specified width. Of course it would be possible to avoid downscaling or increasing the original line width.


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