Hi Thomas,
I am sure you are right, it confirms what I thought. I don't think that there is anything I can do to improve things with such a small barcode.
Again many thanks for your help.
Patrick
-----Original Message-----
From: Thomas DeWeese [mailto:[EMAIL PROTECTED]]
Sent: 29 August 2004 01:32
To: Batik Users
Subject: Re: quality issue with svg barcodes on printer with less than
600dpi
Hi Pegan,
I suspect that this is an aliasing issue. This basically
means that the width of your bar codes might be 3.5 pixels
wide, does the renderer draw 3 or 4 pixels. In this case
the most likely problem is that the bar is 4 pixels wide
but it starts on 1/2 a pixel, this means that the renderer
needs to decide if it should render 5 pixels, 4 pixels or
3 pixels. The way the barcode is currently specified it
is difficult to know.
You may not be aware but the use of 'real world units' like 'mm'
means essentially nothing except on the width/height of the outermost
SVG element. For all other contexts the mapping from the real world
units to userspace units is fixed.
[EMAIL PROTECTED] wrote:
> When I print small interleaved 2 of 5 barcodes on printers with less
> than 600dpi from my application I am getting quality problems.
>
> The barcode has 14 digits and has to fit on a label 35mm wide. I am
> using Krysalis Barcode (now Barcode4J) to generate the barcode svg.
>
> My attached sample svg has 2 barcodes side by side, they look identical
> when viewed in Squiggle but are not identical when printed at a
> resolution of 300dpi or less.
>
> With printers that have 300 dpi or less I find that the bar widths can
> be smaller or larger by one printer dot, likewise the rendered position
> of the line can also vary by a dot in either direction. Although the
> barcodes scan, they can be of very variable quality when checked with a
> barcode verifier (ranging from grade B to F). I frequently find that
> the barcode on the left scans as B and the one on the right fails as an F.
>
> The bars are perfect when printed on printers with 600+ dpi and scan as
> grade A.
>
> Is there anything I can do to improve things ?
> <<f1.svg>>
> Thanks,
> Patrick
>
>
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