output file size with repeated image

output file size with repeated image

[Pablo Rodriguez]

Dear list,

I have the following sample:

    \setupexternalfigure[location=default]
    \starttext
    \startmode[repeated-image]
    \dorecurse{10}{
        \dorecurse{10}{
            \dorecurse{10}{
                \externalfigure[cow]\input zapf\par}}}
    \stopmode
    \startmode[single-image]
    \externalfigure[cow]
    \dorecurse{10}{
        \dorecurse{10}{
            \dorecurse{10}{
                \input zapf\par}}}
    \stopmode
    \startmode[no-image]
    \dorecurse{10}{
        \dorecurse{10}{
            \dorecurse{10}{
                \input zapf\par}}}
    \stopmode
    \stoptext

Output file sizes with different modes are the following:

    --mode=repeated-image    745KB

    --mode=single-image      303KB

    --mode=no-image          302KB

Although the image is the same (and it is only embedded once) file size
with repeated image is almost two and a half times that the version with
a single image.

Is this right or am I missing something?

Many thanks for your help,


Pablo
-- 
http://www.ousia.tk
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Re: output file size with repeated image

[Hans Hagen]

On 4/14/2015 7:07 PM, Pablo Rodriguez wrote:
> Dear list,
>
> I have the following sample:
>
>      \setupexternalfigure[location=default]
>      \starttext
>      \startmode[repeated-image]
>      \dorecurse{10}{
>          \dorecurse{10}{
>              \dorecurse{10}{
>                  \externalfigure[cow]\input zapf\par}}}
>      \stopmode
>      \startmode[single-image]
>      \externalfigure[cow]
>      \dorecurse{10}{
>          \dorecurse{10}{
>              \dorecurse{10}{
>                  \input zapf\par}}}
>      \stopmode
>      \startmode[no-image]
>      \dorecurse{10}{
>          \dorecurse{10}{
>              \dorecurse{10}{
>                  \input zapf\par}}}
>      \stopmode
>      \stoptext
>
> Output file sizes with different modes are the following:
>
>      --mode=repeated-image    745KB
>
>      --mode=single-image      303KB
>
>      --mode=no-image          302KB
>
> Although the image is the same (and it is only embedded once) file size
> with repeated image is almost two and a half times that the version with
> a single image.
>
> Is this right or am I missing something?

(1) each reference to an image takes some 40 bytes (uncompressed)
(2) when you include the image n times you get 3 times as many pages 
which means 400 more page descriptions etc, so you need to add 2 times 
no image minus font overhead which is about what you see

context does some aggressive object sharing anyway so on the average the 
pdf files produced are quite efficient

Hans

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               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: output file size with repeated image

[Pablo Rodriguez]

On 04/14/2015 07:39 PM, Hans Hagen wrote:
> On 4/14/2015 7:07 PM, Pablo Rodriguez wrote:
>> [...]
>> Although the image is the same (and it is only embedded once) file size
>> with repeated image is almost two and a half times that the version with
>> a single image.
>>
>> Is this right or am I missing something?
> 
> (1) each reference to an image takes some 40 bytes (uncompressed)
> (2) when you include the image n times you get 3 times as many pages 
> which means 400 more page descriptions etc, so you need to add 2 times 
> no image minus font overhead which is about what you see
> 
> context does some aggressive object sharing anyway so on the average the 
> pdf files produced are quite efficient

Many thanks for your explanation, Hans.

I totally missed the the triple pages with repeated images.


Pablo
-- 
http://www.ousia.tk
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________