Re: [libreoffice-users] exported PDF file size

Hi,

For my part, I use png for images with less than 256 colours (indexed 
colours). The screenshots with limited number of colours can be handled 
this way with GIMP (using "image/mode/indexed colours, ...").
It is probably what GIF is doing, indexing colours (and discretizing 
continuous colour ramps), because it is limited to 256 colors. This 
should be a faster method than indexing colours with Gimp. I'll try it.

Regards,

Paul

 


On 29/04/2011 23:39, Tom Davies wrote:
> Hi :)
> I tend to save pictures in 3 different formats to see which gives the best
> result for the least size.  I would always keep a copy of the original.
>
> Gif tends to be about 1/10th the size of jpgs or pngs but it doesn't work well
> on smoothly changing shades so some of the pictures on pages 15, 17, 19, 20, 26,
> 57, 79, 81, 111, 116, 120, 127, 135, 136 and 139 might not work well but all the
> rest will probably be better as gifs.
>
> To change formats in Ubuntu just install gimp
>
> sudo apt-get install gimp
>
> and use "Save As ... " the change the file-ending from .jpg (for example) to
> .gif.  Sometimes png is lighter-weight or sometimes jpg although usually those 2
> formats tend to be better for photos.  Png tends to be higher quality than jpg
> but it is also often lighter-weight.  Not always tho which is why i try all 3
> before committing myself to 1.
>
> Note that just changing the format of an image can cause it to degrade a bit or
> even a lot and changing the entire document to pdf can cause further errors to
> creep into images.  At the moment all your images looked fine to a quick "squint
> test".
>
> Do you have all the separate images available to work from?  Can you create a
> new folder for testing different formats?
>
> Good luck and regards from
> Tom :)
>
>
>
>
>
>
> ________________________________
> From: Helmar<tucuna@gmail.com>
> To: users@libreoffice.org
> Sent: Fri, 29 April, 2011 21:49:34
> Subject: Re: [libreoffice-users] exported PDF file size
>
> I think the only thing that can make an effective difference is ro reduce
> JPG compression and the image resolution in the PDF Options screen....
> But you should test some different values to find out one setup that fits
> your needs and keep your images readable.
>
> Helmar Fernandes
> =======================
> Ubuntu Maverick Meerkat user
> www.aquahobby.com
> www.penguim.net/pocosdecaldas
>
>
>
> On 29 April 2011 17:45, Daniel A. Rodriguez<
> daniel.armando.rodriguez@gmail.com>  wrote:
>
> > Hi guys
> >
> > Recently published some material about digital literacy using floss[1],
> > this
> > was completely edited using Writer. The problem I've got is exported pdf
> > size (about 20MB). As there are many screenshots included, is there any way
> > to decrease size without affecting images quality or at least keep them
> > readable.
> >
> >
> > regards.
> >
> > [1] http://tinyurl.com/6lccop6
> >
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