Re: compresslevel and png graphics (mkiv)

["George N. White III" <gnwiii@gmail.com>]

On Wed, May 25, 2011 at 11:40 AM, Hans Hagen <pragma@wxs.nl> wrote:

> On 25-5-2011 2:43, Peter Rolf wrote:
>>
>> Hi,
>>
>> I just made a one pager (TEXpage) out of a big png graphic (5900x4094).
>> The compressed size of the graphics is normally around 1.37MB on the
>> highest png compress level (9) and 1.32MB after using optipng (only
>> around 3% reduction this time). To my surprise the size of the final PDF
>> was about 2.3MB. After adding '\pdfcompresslevel9' the size went down to
>> 1.48MB. Still not what I wanted...
>
> Normally I convert such images to pdf first (using acrobat or gs) simply
> because inclusion of pdf is much faster.

I too convert images to pdf first, but my mainly because I can control
the details
of the conversion to get the best result for each (type of) image.  Some images
are well suited to jpeg compression, others are better with reduced color space
and lossless compression.   The ability to directly include images in
<whatever>tex<t> should be seen as a convenience, but not a basis for a
workflow where the final product has requirements for minimal size, color
rendition, etc.   There are many free image to pdf tools that all do
the easy cases
adequately but don't give the level of control needed for the difficult cases.

SVG is different because much of it is based on a graphics model that resembles
PDF.   Some SVG documents translate directly to PDF, but others, e.g., markers,
may "blow up" when translated.

-- 
George N. White III <aa056@chebucto.ns.ca>
Head of St. Margarets Bay, Nova Scotia
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