Yeah, it's not that either. I can't make sense of this either. Just as an example, one of the original JPEGs is 568x426 and 75kB in size, as a PNG it has the same dimensions but is 374kB in size.
On Sat, Mar 1, 2014 at 2:33 PM, Mark Bourne < libreoffice-ml.mbou...@spamgourmet.com> wrote: > OK. In that case it doesn't look like what I thought. The only other thing > I can think is that perhaps some of those JPEGs do come out smaller when > saved as PNG and LO is doing that to reduce the file size. But that seems > unlikely for photos, as you originally said. Maybe someone else here has > some ideas... > > Mark. > > > > Ra wrote: > >> I never insert images as pictures. The JPEG images are only ever used as >> backgrounds for frames. I also never open the JPEGs in any picture editing >> application and copypaste from there, the images are only ever used as >> files from disk. >> >> What I'm doing is precisely this: >> >> File > Insert > Frame... > OK >> >> >> Then >> >> [right click on the frame created] > Frame... > Background > As: Graphic > >> Browse... > [select the JPEG file from disk] > Type: Area > OK >> >> >> And then repeat, many times, always selecting a different JPEG for the >> background. >> >> >> >> >> On Sat, Mar 1, 2014 at 2:04 PM, Mark Bourne < >> libreoffice-ml.mbou...@spamgourmet.com> wrote: >> >> Sure, but how did you then get those images into LibreOffice? >>> >>> If you use Insert > Picture > From file, LO knows that the file is a JPEG >>> and probably even copies the file as-is into the ODF file. >>> >>> If you open the JPEG file in another application (such as an image >>> editor), then copy from there and paste into LO, in this case LO will >>> only >>> have the bitmap data copied from the image editor. It will not know about >>> the original image file nor what type it was, and probably uses its >>> default >>> format, i.e. PNG, to save that image data within the ODF file. >>> >>> My suspicion is that, although you saved all the source images as JPEGs, >>> those which appear as JPEG in the ODF file were inserted by Insert > >>> Picture > From file, while those which appear as PNG in the ODF file were >>> opened in another application and copied and pasted into LO Writer. >>> >>> Mark. >>> >>> >>> >>> Ra wrote: >>> >>> Good guess but sadly no. All the images are first stored as JPEGs. >>>> That's >>>> how I know they in fact *are* JPEGs. ;-) >>>> >>>> >>>> >>>> Ra wrote: >>>> >>>> Hello, >>>> >>>> I have noticed some unexpected (and possibly inconsistent) behavior of >>>> documents producet with LO Writer. Here's my scenario: I have several >>>> frames in the document and each of them has a JPEG photo as the >>>> background. >>>> Each frame has a different image as a background. There are no other >>>> graphics in the document, just some text. The resulting document ends up >>>> being considerably larger than the sum of all the images and all the >>>> text >>>> content put together. >>>> >>>> Knowing that ODFs are really just ZIP archives, I decided to dig a >>>> little >>>> deeper. Having opened an ODF file with an archiver I noticed most (but >>>> not >>>> all, surprisingly!) of my JPEGs got converted to PNGs before getting >>>> stored. I don't know much about this but up until now I believed LO >>>> stores >>>> all external images as direct file copies, or at the very least in the >>>> original format, so this striked me as odd. >>>> >>>> >>>> Just a guess, but if you copy and paste an image from another file, LO >>>> won't know what format it was in originally (all it has is bitmap data >>>> pasted from the clipboard), so will probably use PNG since it is a >>>> lossless >>>> format. Maybe those in JPEG format were inserted by Insert > Picture > >>>> From >>>> file (or similar), while those in PNG format were opened in another >>>> application, copied from there, and then pasted into LO? >>>> >>>> I've been told the ODF specification recommends using PNGs for >>>> bitmaps >>>> and >>>> SVG for vector graphics. This makes sense generally but is also quite >>>> inefficient for photos as PNG photos tend to be much larger than JPEGs. >>>> It >>>> is also weird that only some of my images got converted. >>>> >>>> Anybody know and can explain the logic behind this? My document >>>> currently >>>> contains about 100 such images, the JPEGs are all together about ~15MB >>>> in >>>> size, the rest of the document is mostly plain text with some >>>> formatting, >>>> and yet my document ends up at about ~47MB. I would like to optimize and >>>> reduce this if possible. >>>> >>>> In case it matters, the document was produced over several weeks in LO >>>> 4.x >>>> or newer on Windows (XP/x86 and 7/x64) and Linux (x86). >>>> >>>> Thank you. >>>> >>>> >>>> -- >>>> To unsubscribe e-mail to: users+unsubscr...@global.libreoffice.org >>>> Problems? >>>> http://www.libreoffice.org/get-help/mailing-lists/how-to-unsubscribe/ >>>> Posting guidelines + more: http://wiki.documentfoundation.org/ >>>> Netiquette >>>> List archive: http://listarchives.libreoffice.org/global/users/ >>>> All messages sent to this list will be publicly archived and cannot be >>>> deleted >>>> >>>> >>>> -- >>> To unsubscribe e-mail to: users+unsubscr...@global.libreoffice.org >>> Problems? http://www.libreoffice.org/get-help/mailing-lists/how-to- >>> unsubscribe/ >>> Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette >>> List archive: http://listarchives.libreoffice.org/global/users/ >>> All messages sent to this list will be publicly archived and cannot be >>> deleted >>> >>> >> > -- > To unsubscribe e-mail to: users+unsubscr...@global.libreoffice.org > Problems? http://www.libreoffice.org/get-help/mailing-lists/how-to- > unsubscribe/ > Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette > List archive: http://listarchives.libreoffice.org/global/users/ > All messages sent to this list will be publicly archived and cannot be > deleted > -- To unsubscribe e-mail to: users+unsubscr...@global.libreoffice.org Problems? http://www.libreoffice.org/get-help/mailing-lists/how-to-unsubscribe/ Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette List archive: http://listarchives.libreoffice.org/global/users/ All messages sent to this list will be publicly archived and cannot be deleted
