Clarification on methods of toggling maximum compression

Clarification on methods of toggling maximum compression

[Kip Warner]

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Hey list,

I've noticed at least three methods of setting what I think is the
generated PDF to maximum compression.

\setupbackend[level=9]
\pdfcompresslevel9
\maximumpdfcompression

Are these all redundant? Do they do different things? Do I need but one
to achieve the desired maximum compression of the resulting PDF?

-- 
Kip Warner -- Software Engineer
OpenPGP encrypted/signed mail preferred
http://www.thevertigo.com

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Re: Clarification on methods of toggling maximum compression

[Hans Hagen]

On 11-8-2012 00:19, Kip Warner wrote:
> Hey list,
>
> I've noticed at least three methods of setting what I think is the
> generated PDF to maximum compression.

the official way, plays nicely with pdf standards:

> \setupbackend[level=9]

pretty low level, might even disappear (overloaded):

> \pdfcompresslevel9

low level, but wil stay:

> \maximumpdfcompression

> Are these all redundant? Do they do different things? Do I need but one
> to achieve the desired maximum compression of the resulting PDF?

keep in mind that max compression slows down processing and often not 
much is gained

Hans

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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Re: Clarification on methods of toggling maximum compression

[Kip Warner]

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On Sat, 2012-08-11 at 00:57 +0200, Hans Hagen wrote:
> > Are these all redundant? Do they do different things? Do I need but one
> > to achieve the desired maximum compression of the resulting PDF?
> 
> keep in mind that max compression slows down processing and often not 
> much is gained

Hey Hans. My document shrinks from about 70 MB to 20MB with compression.
But back to my original question, do I need all three or are they all
redundant and only one of them I actually need? If only one is
necessary, should I just use \setupbackend[level=9] ?

-- 
Kip Warner -- Software Engineer
OpenPGP encrypted/signed mail preferred
http://www.thevertigo.com

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Re: Clarification on methods of toggling maximum compression

[Hans Hagen]

On 11-8-2012 01:00, Kip Warner wrote:
> On Sat, 2012-08-11 at 00:57 +0200, Hans Hagen wrote:
>>> Are these all redundant? Do they do different things? Do I need but one
>>> to achieve the desired maximum compression of the resulting PDF?
>>
>> keep in mind that max compression slows down processing and often not
>> much is gained
>
> Hey Hans. My document shrinks from about 70 MB to 20MB with compression.

hm, suspicious

> But back to my original question, do I need all three or are they all
> redundant and only one of them I actually need? If only one is
> necessary, should I just use \setupbackend[level=9] ?

yes, that's best because as soon as that command is called, the set 
value of 'level' is used, no matter what other values has been set

never use \pdf* commands directly .. way too low level and use the oher 
command only for fast tests (i use it in small test files)

Hans

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: Clarification on methods of toggling maximum compression

[Kip Warner]

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On Sat, 2012-08-11 at 01:05 +0200, Hans Hagen wrote:
> hm, suspicious

Really? It's over 300 pages in length and contains plenty of vector
graphics (more text). But actually that 70 MB seems an overestimate and
I must have been looking at something else.

> yes, that's best because as soon as that command is called, the set 
> value of 'level' is used, no matter what other values has been set

Here is the result of some experimentation:

23,396,929 Bytes using just \setupbackend[level=9].

21,945,243 Bytes using the aforementioned, \pdfcompresslevel9, and
\maximumpdfcompression.

23,396,827 Bytes using none of those three.

So I guess I'm still not sure which one to use since the one you said
should be sufficient doesn't seem to compress it fully.

> never use \pdf* commands directly .. way too low level and use the oher 
> command only for fast tests (i use it in small test files)

Understood.

-- 
Kip Warner -- Software Engineer
OpenPGP encrypted/signed mail preferred
http://www.thevertigo.com

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Re: Clarification on methods of toggling maximum compression

[Hans Hagen]

On 11-8-2012 01:26, Kip Warner wrote:
> On Sat, 2012-08-11 at 01:05 +0200, Hans Hagen wrote:
>> hm, suspicious
>
> Really? It's over 300 pages in length and contains plenty of vector
> graphics (more text). But actually that 70 MB seems an overestimate and
> I must have been looking at something else.
>
>> yes, that's best because as soon as that command is called, the set
>> value of 'level' is used, no matter what other values has been set
>
> Here is the result of some experimentation:
>
> 23,396,929 Bytes using just \setupbackend[level=9].
>
> 21,945,243 Bytes using the aforementioned, \pdfcompresslevel9, and
> \maximumpdfcompression.
>
> 23,396,827 Bytes using none of those three.
>
> So I guess I'm still not sure which one to use since the one you said
> should be sufficient doesn't seem to compress it fully.
>
>> never use \pdf* commands directly .. way too low level and use the oher
>> command only for fast tests (i use it in small test files)

I made

\setupbackend[level=9]

listen to that setting also if no 'format' is set. Also, in the report 
at the end of a run, the compress levels are reported so that you can 
check it.


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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: Clarification on methods of toggling maximum compression

[Kip Warner]

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On Sat, 2012-08-11 at 12:02 +0200, Hans Hagen wrote:
> I made
> 
> \setupbackend[level=9]
> 
> listen to that setting also if no 'format' is set. Also, in the report 
> at the end of a run, the compress levels are reported so that you can 
> check it.

Thanks Hans. I'll use that when I pull the next nightly.

-- 
Kip Warner -- Software Engineer
OpenPGP encrypted/signed mail preferred
http://www.thevertigo.com

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