Created attachment 141187 [details] Quality output I hate this big presentations. you add 5 images and the presentation is 15 mb large. but with default settings your output result (doesn't matter which setting) should be always ok. When the presentation is really to big, than the user can change the jpg setting manual. Defaults for jpg compression: 70 Screen 75 Presentation 80 Print with this default settings you can guaranty a good compromise between size and quality.
Do you suggest to change Tools > Minimize Presentation.. (3rd step) from 75/150/300dpi depending on what has been selected on step 1 to 70/75/80dpi? Quite unusual values, IMHO. (=> WFM)
I don't talk about resolution I talk about jpeg compression
(In reply to andreas_k from comment #2) > I don't talk about resolution I talk about jpeg compression Those are 25, 50, 75% today (still WFM). Tomaz, what's your take on this?
Well the values are not percentual, so it is not 25% 50% 75% as the size/quality factor doesn't increase linearly so you can't say much from the values itself. Anyway, value 25 JPEG compression will pretty much destroy your image (bye bye gradients), 50 is also too low. I would say that the most sensible values are between 60 - 90. Most people won't see any difference between 75-100, but the difference in size is big. All this also very much depends on the image itself. The assumption here is that the image is photo, where JPEG makes must sense. For screen images the the quality factor can get quite different (a lot of edges in the image) and the most quality killer here is the 4:2:0 subsampling, which we always use (it is possible to use 4:4:4 subsampling but we never do that). So just for this profiles I would recommend to use a constant quality factor - maybe 75 or 80 for all uses. The biggest saver here is the downsampling of the image anyway. I tried a 8MB JPEG picture at 300DPI and 80 QF is already 1MB, at 150DPI we are already in 300kb range and 96DPI <200kb. I would say that's good enough for most people.
So let's go with the suggestion. Changing default values is likely an easyhack and code pointers shouldnt too hard to find.
The numbered values implies a percentage, which is wrong. So the better solution here is a slider with arbitrary values from 1 to 9 (and we assign internally 50-95 or so). But then it's not an easyhack anymore.
I'm against a ruler cause the number is cmomon for jpeg pictures. All cameras use the quality number between 1 and 100. https://en.wikipedia.org/wiki/JPEG What's wrong is the % cause it's not a percentage so only quality will be enough.
can we define better defaults, than we can close the bug and everybody will be fine.
can someone add a codepointer than I can fix it.
officecfg/registry/data/org/openoffice/Office/PresentationMinimizer.xcu
but where are the default settings stored? jpeg compression: 50 should be change to 80.
andreas kainz committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=5442670e4c643ef476fe154df9a0d226b7252d3a tdf#116861: better default settings for minimize Presentation It will be available in 6.2.0. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
andreas kainz committed a patch related to this issue. It has been pushed to "libreoffice-6-1": http://cgit.freedesktop.org/libreoffice/core/commit/?id=747dadd2f55b9181b2619a9b51cba7b5b849f476&h=libreoffice-6-1 tdf#116861: better default settings for minimize Presentation It will be available in 6.1.0.2. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
Default is now 70,75, and 80 depending on the type. Would be good to add a release note.