Apache OpenOffice (AOO) Bugzilla – Issue 17678
Jpeg export file size/quality
Last modified: 2003-09-12 10:54:30 UTC
I have been using Draw to work with photos (imported in jpeg format via clipboard). When I export from Draw in jpeg, selecting 100% quality gives me much smaller images than I am accustomed to from other applications (of order 1/10th the size!). Do these exports really have maximum quality or are they actually reduced quality due to lossy compression? Thanks Dave
Please give me a hint with which other applications you are comparing. Just to get you right: You insert a picture in jpg format from another application using the clipcoard, manipulate it and then export it as a new jpg? And then it has a different size compared to a picture manipulated the same way in a different application? Have you tried to open the jpg file using "file open" or "insert graphics"? Thanks in advance.
Thanks for the reply. Sorry for the delay in my reply -- I've been away on vacation. I did some further experiments and found that the JPEG converter in OpenOfficeDraw is actually about in the middle (my original concern must have been the peculiar characteristics of that photo). I tested it against a couple of freeware programs (IrfanView and Xnview) and against Corel PhotoPaint10. I started with a 2.1 MB photo (as jpeg'ed by the camera) and saved it in all cases using the "best" quality setting. The results were: OOdraw 3.0 MB Irfanview 2.7 MB Xnview 2.7 MB CorelPhotoPaint 4.2 MB It is hard to say if there is any significant quality difference without some objective measure. On a related issue, I note that when I save the same photo in PDF using the OpenOffice pdf exporter the file size is only 684K; using Acrobat to make the pdf gives a file size of 1.3M (both set on "press"). Does the 684K pdf file actually have the same quality as the 3MB jpeg files? You can mark this issue as closed -- sorry that it was a false alarm.
->Reassigned to Sven. Hello Sven, do you have any additional thoughts to the last point? Thanks!
I believe that this is an issue that could be improved upon, so I am setting the status to NEW. After some testing I found that while the resolution when exporting to jpeg might be ok, it's not real good. I think that allowing the user to set an actual resolution for the image to be saved with would help a lot, I have also noticed that if I save as a html file that it gives me the option of saving my image as a jpeg and then gives me three different resolutions to choose from. This seems to me like a better jpeg export than the plain jpeg export tool. However I still think that OpenOffice should support higher resolutions, for instance, Corel photo paint can go up to a resolution of 30,000 x 30,000 pixels, this is absolutely huge, but why not allow it?. Why not support real high resolutions for those that want it?
I've done a little more testing and found that I can make the page size bigger, and then when I export to JPEG, it has a higher resolution, I assume this means that it is being encoded at a specific DPI of the original document, so maybe we just a thing to increases the DPI it's encoding at, although I still think you ought to be able to just set a total resolution i.e. 1024 x 768 as well. Basicly we'll be giving the user a lot more control over the export.
marked as duplicate to #i4499# *** This issue has been marked as a duplicate of 4499 ***
I closed this issue because of duplicity.