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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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