There is a program called graphics converter that might help in your situation. Also, I believe that Quicktime is probably the underlying framework that preview uses for conversions.
JOnathan On Sep 2, 2011, at 6:17 PM, Paul Hopewell wrote: > Hi Esther, > Many thanks for your reply. > > I was using Preview to convert a JPEG file to a PNG file. I created a > duplicate of the JPEG file and then did a save of that duplicate after > setting the file type to PNG. All this is on my normal Lion hard disk. The > process had worked for several files but I had not been very good at deleting > old files so quite a few were still left around. The files which won't save > are the PNG versions of two files which do not exist anywhere other than as > working files in Preview. > > I have indeed tried re-booting and clearing caches which did allow me to > reduce my 10 open files to just 2 open files so that is progress. > > It is getting late now but I will try your idea of rebooting in safe mode. > > I do have Onyx and Cocktail - would they help at all? > > I am away tomorrow so more work on this will have to wait until Sunday. I > will keep you posted on how it goes.... > > Many thanks. > > Paul Hopewell > On 2 Sep 2011, at 22:54, Esther wrote: > >> Hi Paul, >> >> This one is a puzzler, but it sounds as though you might be using Preview to >> make changes in a graphics file using the Tools menu. Alternatively, could >> you be opening a file that is corrupted, or not really a supported file >> type? If the file is on an external volume that is not writable, make sure >> that you leave any windows that point there. (For example, on an externally >> mounted hard drive, I sometimes navigate down to a directory in a Terminal >> window.) >> >> What happens if you force quit the app, and then go to the affected file(s) >> in question and select it to open by default in some other app, like Skim? >> Can you check with the Activity Monitor that Preview is not running at all >> after you force quit? >> >> I assume that you tried restarting your machine and also clearing out >> caches? I've found that in some instances I can fix problems by booting into >> Safe Mode, which moves problem caches, including font caches that can be a >> problem for Preview, into the Trash. I believe that Martin McCormick has >> used this, and also reported that he was able to log into the machine via >> SSH past a certain point. >> >> The problem with safe mode boot is that audio is disabled, so you can't run >> VoiceOver. However, I've been able to fix some problems by just booting into >> Safe Mode, and then restarting my machine after I've done this, without >> having to actually access the system under Safe Mode. You hold down the >> Shift key when the system boots up, and the boot process takes longer to do >> than usual, because a directory check of the startup volume is forced as >> part of the process. >> >> Here's the Apple Document about booting Mac OS X into Safe Mode: >> http://support.apple.com/kb/HT1455 >> >> A google check indicates that Safe Mode should still work under Lion. >> Sorry not to have more thoughts about this. >> >> Cheers, >> >> Esther >> >> On Sep 2, 2011, at 11:16, Paul Hopewell wrote: >> >>> Hello, >>> I am running Mac OS 10.7.1 and am stuck in a hang/loop in Preview. >>> >>> Whenever I try to exit Preview or close a Preview window I have a dialogue >>> asking if I want to save the changes to file x. Whatever I choose (don't >>> save, cancel, save) I cannot get out of this loop. I have to force quit >>> Preview. >>> >>> If I select the window chooser wile Preview is the active window I see some >>> 10 windows related to different unsaved Preview documents. Whichever one I >>> choose I still cannot exit Preview. >>> >>> If I look at the Preview Windows menu I see that two windows are checked >>> for display. That is probably a bug and may be the cause of my problems. If >>> I try to look at the Preview preferences I go back to the save dialogue and >>> again have to force quit Preview. >>> >>> SO how can I recover from this situation and make Preview usable again? I >>> tried deleting all the Preview preferences in the LIbrary folder but that >>> did not help. I have time machine and SuperDuper! backups but I don't want >>> to reset my entire system to some earlier time before the above problem >>> arose. I just want to reset Preview to an earlier time. >>> >>> I would appreciate any suggestions as to what I should do. >>> >>> Many thanks. >>> >>> Paul Hopewell >> >> <--- Mac Access At Mac Access Dot Net ---> >> >> To reply to this post, please address your message to >> [email protected] >> >> You can find an archive of all messages posted to the Mac-Access forum at >> either the list's own dedicated web archive: >> <http://mail.tft-bbs.co.uk/pipermail/mac-access/index.html> >> or at the public Mail Archive: >> <http://www.mail-archive.com/[email protected]/>. >> Subscribe to the list's RSS feed from: >> <http://www.mail-archive.com/[email protected]/maillist.xml> >> >> The Mac-Access mailing list is guaranteed malware, spyware, Trojan, virus >> and worm-free! >> >> Please remember to update your membership options periodically by visiting >> the list website at: >> <http://mail.tft-bbs.co.uk/mailman/listinfo/mac-access/options/> >> > > <--- Mac Access At Mac Access Dot Net ---> > > To reply to this post, please address your message to > [email protected] > > You can find an archive of all messages posted to the Mac-Access forum at > either the list's own dedicated web archive: > <http://mail.tft-bbs.co.uk/pipermail/mac-access/index.html> > or at the public Mail Archive: > <http://www.mail-archive.com/[email protected]/>. > Subscribe to the list's RSS feed from: > <http://www.mail-archive.com/[email protected]/maillist.xml> > > The Mac-Access mailing list is guaranteed malware, spyware, Trojan, virus and > worm-free! > > Please remember to update your membership options periodically by visiting > the list website at: > <http://mail.tft-bbs.co.uk/mailman/listinfo/mac-access/options/> <--- Mac Access At Mac Access Dot Net ---> To reply to this post, please address your message to [email protected] You can find an archive of all messages posted to the Mac-Access forum at either the list's own dedicated web archive: <http://mail.tft-bbs.co.uk/pipermail/mac-access/index.html> or at the public Mail Archive: <http://www.mail-archive.com/[email protected]/>. 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