Thumbnails blury in digiKam 1.0.0
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Thumbnails blury in digiKam 1.0.0
 
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Hi,
After upgrading to digiKam most of the thumbnails are blury. Specifically for jpeg images, but to some degree even with png images. The CRW thumbnails seems to be better. I have tried with regeneration of all thumbnails, but without any luck. Are there any parameters to tune to get better results? Is it possible to regenerate a subset of all images? I'm running openSUSE 11.2 with digiKam from KDE:Backports. /Anders _______________________________________________ Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
Re: Thumbnails blury in digiKam 1.0.0
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Am Sun, 17 Jan 2010 16:36:09 +0100
schrieb Stedtlund <[hidden email]>: > Hi, > > After upgrading to digiKam most of the thumbnails are blury. Do you mean upgrading digiKam 0.10 (or earlier) to 1.0? The internal thumbnails format changed. The change is described in the changelog as follows: "General : digiKam use a new database to cache thumbnails instead ~./thumbnails. File format used to store image is PGF (http://www.libpgf.org). PGF is a wavelets based image compression format and give space optimizations." I also noticed a decline in thumbnail quality, but I did not consider it problematic enough to write a bug report for it. But maybe you could open one? As I wrote in a comment on a bug report related to this change in digiKam thumbnail storage, I'd still prefer a thumbnail directory shared between applications... but since the type of directory proposed there (with subdirectories made of MD5 hash sums) apparently does not exist for thumbnails yet, this would be a fair amount of work for digiKam developers: https://bugs.kde.org/show_bug.cgi?id=210580#c15 > Are there any parameters to tune to get better results? That would be a useful option indeed. Vlado _______________________________________________ Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
Re: Thumbnails blury in digiKam 1.0.0
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2010/1/18 Vlado Plaga <[hidden email]>:
> Am Sun, 17 Jan 2010 16:36:09 +0100 > schrieb Stedtlund <[hidden email]>: > >> Hi, >> >> After upgrading to digiKam most of the thumbnails are blury. > > Do you mean upgrading digiKam 0.10 (or earlier) to 1.0? Yes, that's what I mean. A miss from my side. >The internal > thumbnails format changed. The change is described in the changelog as > follows: > > "General : digiKam use a new database to cache thumbnails instead > ~./thumbnails. File format used to store image is PGF > (http://www.libpgf.org). PGF is a wavelets based image compression > format and give space optimizations." I read that too, but I thougth that was going to be possitive... > > I also noticed a decline in thumbnail quality, but I did not consider > it problematic enough to write a bug report for it. But maybe you could > open one? I can do that! > > As I wrote in a comment on a bug report related to this change in > digiKam thumbnail storage, I'd still prefer a thumbnail directory > shared between applications... but since the type of directory proposed > there (with subdirectories made of MD5 hash sums) apparently does not > exist for thumbnails yet, this would be a fair amount of work for > digiKam developers: > https://bugs.kde.org/show_bug.cgi?id=210580#c15 > >> Are there any parameters to tune to get better results? > > That would be a useful option indeed. > > Vlado > _______________________________________________ > Digikam-users mailing list > [hidden email] > https://mail.kde.org/mailman/listinfo/digikam-users > Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
Re: Thumbnails blury in digiKam 1.0.0
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This can be relevant of PGF compression level. In digiKam, thumbs
compression is there : http://lxr.kde.org/source/extragear/graphics/digikam/libs/threadimageio/thumbnailcreator.cpp#501 Last value passed to this method is compression level. Try 3 or 2 to see if quality is better. You need to force digiKam to rebuild thumbnails of course. Note : perhaps it's a problem in LibPGF. I recommend to as to PGF team also, just to be sure... Gilles Caulier 2010/1/18 Stedtlund <[hidden email]>: > 2010/1/18 Vlado Plaga <[hidden email]>: >> Am Sun, 17 Jan 2010 16:36:09 +0100 >> schrieb Stedtlund <[hidden email]>: >> >>> Hi, >>> >>> After upgrading to digiKam most of the thumbnails are blury. >> >> Do you mean upgrading digiKam 0.10 (or earlier) to 1.0? > Yes, that's what I mean. A miss from my side. > >>The internal >> thumbnails format changed. The change is described in the changelog as >> follows: >> >> "General : digiKam use a new database to cache thumbnails instead >> ~./thumbnails. File format used to store image is PGF >> (http://www.libpgf.org). PGF is a wavelets based image compression >> format and give space optimizations." > I read that too, but I thougth that was going to be possitive... > >> >> I also noticed a decline in thumbnail quality, but I did not consider >> it problematic enough to write a bug report for it. But maybe you could >> open one? > I can do that! > >> >> As I wrote in a comment on a bug report related to this change in >> digiKam thumbnail storage, I'd still prefer a thumbnail directory >> shared between applications... but since the type of directory proposed >> there (with subdirectories made of MD5 hash sums) apparently does not >> exist for thumbnails yet, this would be a fair amount of work for >> digiKam developers: >> https://bugs.kde.org/show_bug.cgi?id=210580#c15 >> >>> Are there any parameters to tune to get better results? >> >> That would be a useful option indeed. >> >> Vlado >> _______________________________________________ >> Digikam-users mailing list >> [hidden email] >> https://mail.kde.org/mailman/listinfo/digikam-users >> > _______________________________________________ > Digikam-users mailing list > [hidden email] > https://mail.kde.org/mailman/listinfo/digikam-users > Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
Re: Thumbnails blury in digiKam 1.0.0
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2010/1/18 Gilles Caulier <[hidden email]>:
> This can be relevant of PGF compression level. In digiKam, thumbs > compression is there : > > http://lxr.kde.org/source/extragear/graphics/digikam/libs/threadimageio/thumbnailcreator.cpp#501 > > Last value passed to this method is compression level. Try 3 or 2 to > see if quality is better. You need to force digiKam to rebuild > thumbnails of course. This implies that I need to build digiKam manually. I'ts not impossible, but a little cumbersome as I have not done this before. I looked a little of the source above and there is another thing one can try, that's changing dbInfo.type = DatabaseThumbnail::PGF to something else. Unfortunately this i a hard coded value, it might be a candidate to have this one configurable from settings or config file. Also the third parameter to writePGFImageData could be configurable in some way. > > Note : perhaps it's a problem in LibPGF. I recommend to as to PGF team > also, just to be sure... I can do that. Where can I get in contact with them? > > Gilles Caulier > > 2010/1/18 Stedtlund <[hidden email]>: >> 2010/1/18 Vlado Plaga <[hidden email]>: >>> Am Sun, 17 Jan 2010 16:36:09 +0100 >>> schrieb Stedtlund <[hidden email]>: >>> >>>> Hi, >>>> >>>> After upgrading to digiKam most of the thumbnails are blury. >>> >>> Do you mean upgrading digiKam 0.10 (or earlier) to 1.0? >> Yes, that's what I mean. A miss from my side. >> >>>The internal >>> thumbnails format changed. The change is described in the changelog as >>> follows: >>> >>> "General : digiKam use a new database to cache thumbnails instead >>> ~./thumbnails. File format used to store image is PGF >>> (http://www.libpgf.org). PGF is a wavelets based image compression >>> format and give space optimizations." >> I read that too, but I thougth that was going to be possitive... >> >>> >>> I also noticed a decline in thumbnail quality, but I did not consider >>> it problematic enough to write a bug report for it. But maybe you could >>> open one? >> I can do that! >> >>> >>> As I wrote in a comment on a bug report related to this change in >>> digiKam thumbnail storage, I'd still prefer a thumbnail directory >>> shared between applications... but since the type of directory proposed >>> there (with subdirectories made of MD5 hash sums) apparently does not >>> exist for thumbnails yet, this would be a fair amount of work for >>> digiKam developers: >>> https://bugs.kde.org/show_bug.cgi?id=210580#c15 >>> >>>> Are there any parameters to tune to get better results? >>> >>> That would be a useful option indeed. >>> >>> Vlado >>> _______________________________________________ >>> Digikam-users mailing list >>> [hidden email] >>> https://mail.kde.org/mailman/listinfo/digikam-users >>> >> _______________________________________________ >> Digikam-users mailing list >> [hidden email] >> https://mail.kde.org/mailman/listinfo/digikam-users >> > _______________________________________________ > Digikam-users mailing list > [hidden email] > https://mail.kde.org/mailman/listinfo/digikam-users > Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
Re: Thumbnails blury in digiKam 1.0.0
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2010/1/19 Stedtlund <[hidden email]>:
> 2010/1/18 Gilles Caulier <[hidden email]>: >> This can be relevant of PGF compression level. In digiKam, thumbs >> compression is there : >> >> http://lxr.kde.org/source/extragear/graphics/digikam/libs/threadimageio/thumbnailcreator.cpp#501 >> >> Last value passed to this method is compression level. Try 3 or 2 to >> see if quality is better. You need to force digiKam to rebuild >> thumbnails of course. > > This implies that I need to build digiKam manually. I'ts not > impossible, but a little cumbersome as I have not done this before. > > I looked a little of the source above and there is another thing one > can try, that's changing dbInfo.type = DatabaseThumbnail::PGF to > something else. Unfortunately this i a hard coded value, it might be a > candidate to have this one configurable from settings or config file. > Also the third parameter to writePGFImageData could be configurable in > some way. > >> >> Note : perhaps it's a problem in LibPGF. I recommend to as to PGF team >> also, just to be sure... > > I can do that. Where can I get in contact with them? Look there : http://www.libpgf.org/ There is a forum in SF.net Gilles Gilles > >> >> Gilles Caulier >> >> 2010/1/18 Stedtlund <[hidden email]>: >>> 2010/1/18 Vlado Plaga <[hidden email]>: >>>> Am Sun, 17 Jan 2010 16:36:09 +0100 >>>> schrieb Stedtlund <[hidden email]>: >>>> >>>>> Hi, >>>>> >>>>> After upgrading to digiKam most of the thumbnails are blury. >>>> >>>> Do you mean upgrading digiKam 0.10 (or earlier) to 1.0? >>> Yes, that's what I mean. A miss from my side. >>> >>>>The internal >>>> thumbnails format changed. The change is described in the changelog as >>>> follows: >>>> >>>> "General : digiKam use a new database to cache thumbnails instead >>>> ~./thumbnails. File format used to store image is PGF >>>> (http://www.libpgf.org). PGF is a wavelets based image compression >>>> format and give space optimizations." >>> I read that too, but I thougth that was going to be possitive... >>> >>>> >>>> I also noticed a decline in thumbnail quality, but I did not consider >>>> it problematic enough to write a bug report for it. But maybe you could >>>> open one? >>> I can do that! >>> >>>> >>>> As I wrote in a comment on a bug report related to this change in >>>> digiKam thumbnail storage, I'd still prefer a thumbnail directory >>>> shared between applications... but since the type of directory proposed >>>> there (with subdirectories made of MD5 hash sums) apparently does not >>>> exist for thumbnails yet, this would be a fair amount of work for >>>> digiKam developers: >>>> https://bugs.kde.org/show_bug.cgi?id=210580#c15 >>>> >>>>> Are there any parameters to tune to get better results? >>>> >>>> That would be a useful option indeed. >>>> >>>> Vlado >>>> _______________________________________________ >>>> Digikam-users mailing list >>>> [hidden email] >>>> https://mail.kde.org/mailman/listinfo/digikam-users >>>> >>> _______________________________________________ >>> Digikam-users mailing list >>> [hidden email] >>> https://mail.kde.org/mailman/listinfo/digikam-users >>> >> _______________________________________________ >> Digikam-users mailing list >> [hidden email] >> https://mail.kde.org/mailman/listinfo/digikam-users >> > _______________________________________________ > Digikam-users mailing list > [hidden email] > https://mail.kde.org/mailman/listinfo/digikam-users > Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
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