Hi Christian, LT has an in memory cache of thumbnails for speed. When you scroll through collections larger than your cache you will be continually dropping and regenerating thumbnails - I personally prefer to just use small collections as a simplistic solution.
Even if you don't choose jpeg or jpeg+DNG but just choose DNG that Pentax DNG file will contain an embedded jpg for which you can set the quality . If you choose large size options for that embedded jpeg it will presumably be slower to generate thumbs as dt will have to read and process more of the file for each one. If you choose to have no embedded jpeg at all (I'm not sure if this is actually possible) it would be *much* slower as dt will have to read the whole raw (rather than just the embedded jpeg component) to generate its thumbnail. So if you want rapid thumbs - set small embedded jpegs in your DNG. And use small collections. And if that isn't enough for you also browse the dt info for setting cache sizes and stuff. Rob. -----Original Message----- From: Christian Kanzian [mailto:christian.kanz...@gmx.at] Sent: 30 October 2015 15:44 To: Albert Castells Cc: darktable-users Subject: Re: [Darktable-users] DT 1.7? Hi, >Gesendet: Freitag, 30. Oktober 2015 um 06:46 Uhr >Von: "Albert Castells" <gigafak...@gmail.com> >An: "Robert William Hutton" <r...@helms-deep.net> >Cc: darktable-users <darktable-users@lists.sourceforge.net> >Betreff: Re: [Darktable-users] DT 1.7? >I always use the last git version and I find that thumbnails still are showed >very slowly on lighttable for my Pentax K3 collections, having each collection >as much as 100 pictures. So I am no alone? To me it seems like that thumbs get regenerated more often than needed? Sometimes thumbs are there and sometimes it takes a second. BTW I do not use the embedded jpg and use DNG from my Pentax K-5. >Otherwise, navigation is faster when showing thumbnails of an Olympus E-PL5. >Running on Ubuntu 15.04 (on SSD), Athlon II 640X4 3Ghz, 8GbRam, GTX750 2Gb. >Any thoughts? No. Would be interesting what is causing this delay, but I do not know how to analyze what is going on. Christian ------------------------------------------------------------------------------ _______________________________________________ Darktable-users mailing list Darktable-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-users This email is confidential and is intended for the addressee only. If you are not the addressee, please delete the email and do not use it in any way. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the company. NHBC reserves the right to monitor all email communications. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. NHBC, the National House-Building Council, is limited by guarantee in England, No 320784. Registered address: NHBC House, Davy Avenue, Knowlhill, Milton Keynes MK5 8FP. NHBC is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and Prudential Regulation Authority. NHBC Building Control Services Ltd, registered by guarantee in England with Company No. 01952969. Registered address: NHBC House, Davy Avenue, Knowlhill, Milton Keynes MK5 8FP. NHBC Services Ltd registered by guarantee in England, No 03067703. Registered address: NHBC House, Davy Avenue, Knowlhill, Milton Keynes MK5 8FP. If you make a claim under a Buildmark policy your personal details will be stored and processed in accordance with the Data Protection Act. Your personal details may be passed to others involved with your claim such as the original builder, or a consultant or remedial works contractor that we may employ in connection with your claim(s) and matter ancillary to your claim(s). Other than disclosure provided for in this statement, we will not pass any data about you to any other party without your permission unless we are required to do so by law. ------------------------------------------------------------------------------ _______________________________________________ Darktable-users mailing list Darktable-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-users
