Re: PDF sizes

Re: PDF sizes

[Taco Hoekwater]

Hi,

ntg-context-bounces@ntg.nl wrote:
> 
> From: Mohamed Bana <mbana.lists@googlemail.com>
> Date: Fri, 15 May 2009 19:51:31 +0100
> To: mailing list for ConTeXt users <ntg-context@ntg.nl>
> 
> 
> Hi all,
> 
> why is the PDF generated from luatex so much smaller in size?  When I 
> compile slightly larger documents the difference is quite noticeable, 
> e.g., 300 KB for pdftex and 56 KB for the same document.
> 
> -rw-r--r-- 1 mbana mbana  13K 2009-05-15 19:48 luasize.pdf
> -rw-r--r-- 1 mbana mbana  56K 2009-05-15 19:39 pdfsize.pdf

Because mkiv+luatex treats the fonts differently. If you compare
the fonts in the pdf documents, you'll see this difference:

[taco@ntg tmp]$ pdffonts luasize.pdf
name                                 type         emb sub uni object ID
------------------------------------ ------------ --- --- --- ---------
CLWCAI+LMMono10-Regular              CID Type 0C  yes yes yes      4  0
FRSDEY+MinionPro-Regular             CID Type 0C  yes yes yes      5  0

[taco@ntg tmp]$ pdffonts pdfsize.pdf
name                                 type         emb sub uni object ID
------------------------------------ ------------ --- --- --- ---------
TPEDRB+LMMono10-Regular              Type 1       yes yes yes      4  0
QCXLWN+WarnockPro-Regular            Type 1       yes yes yes      5  0


The 'CID Type 0' vs 'Type 1' is about encoding (2bytes vs 1byte);
the key to the different sizes is the 'C' in the type category.

In the luatex case, the fonts are internally converted to the newer
'Type 1 CFF' font format, which is much more compact than 'oldfashioned'
Type 1. IIRC, dvipdfmx uses 'Type 1C' (1byte CFF), so that should also
be smaller than pdftex.

Best wishes,
Taco



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