Hi :) Gif is the ancient format (relatively) and is relatively unsophisticated. Png is designed to have all the functionality so that it can take over. I think Png is an Open format whereas Gif is proprietary although that might be a simplification.
Gif might be better for website's logos and easier at the moment but sophisticated use of png is the way forwards. Apparently it's an Open Format whereas Gif is proprietary. I just don't know how to do the colour indexing stuff. I guess it's worth having a quick go at Gif in case it does give a better result faster. Good luck and regards from Tom :) PS. Png is also set to take over from Jpg as it also handles larger images better and again Jpg is a proprietary format (i think). ________________________________ From: Paul Lens <[email protected]> To: [email protected] Sent: Sat, 30 April, 2011 20:02:56 Subject: 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<[email protected]> > To: [email protected] > 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< > [email protected]> 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 >> >> --~--~---------~--~----~------------~-------~--~----~ >> Escuelas Libres :: Porque la educación es mucho mejor cuando es libre >> www.escuelaslibres.org.ar >> --- >> Para entrenar, cualquier programa sirve. Para educar, sólo Software Libre. >> (Federico Heinz) >> --- >> >> -- >> Unsubscribe instructions: E-mail to [email protected] >> Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette >> List archive: http://listarchives.libreoffice.org/www/users/ >> All messages sent to this list will be publicly archived and cannot be >> deleted >> >> -- Unsubscribe instructions: E-mail to [email protected] Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette List archive: http://listarchives.libreoffice.org/www/users/ All messages sent to this list will be publicly archived and cannot be deleted -- Unsubscribe instructions: E-mail to [email protected] Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette List archive: http://listarchives.libreoffice.org/www/users/ All messages sent to this list will be publicly archived and cannot be deleted
