RAW and PNG compression

[Francesco Scaglioni-2]

Hi,

Now that digikam (0.10) can "read" the raw files from my
canon I was intrigued to see that digikam reports the raw
file as bing 15mb in size but the compressed (level 9) png
file derived from it is reported at 24 mb.  What ami I
missing ?


TIA


Francesco

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The same is true for me too. RAW files are about 12-15 MB, PNG files grow > 50 MB!!!! I use a Canon EOS450D (12.2 Mp).

Regards,

Francisco

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[arve-2-2]

Francisco Lorés Ara skrev:
> The same is true for me too. RAW files are about 12-15 MB, PNG files
> grow > 50 MB!!!! I use a Canon EOS450D (12.2 Mp).
>
>
In a RAW file there is only value for one colour for each pixel,
normally 12 - 14 for each bit.
In a PNG file you have value for 3 colours for each bit. In a 16 bit PNG
file you have 16 bit for each colour giving 48 bit for each pixel.

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[Rei Shinozuka]

similar tale of woe, DNG raw file = 10.5MB, png = 53MB.
(jpg = 2MB)

-rw-r--r-- 1 shino shino 52853489 2009-05-19 21:27 kitty-21.png
-rw-r--r-- 1 shino shino  1921690 2009-05-19 21:57 kitty-21-2.jpeg
-rw-r--r-- 1 shino shino 10575296 2009-05-20 20:14 L8663385.DNG


digikam 11 from source, -- works with new RWL files!

digiKam version 0.11.0-svn (rev.: 968958)
Exiv2 can write to Jp2: Yes
Exiv2 can write to Jpeg: Yes
Exiv2 can write to Png: Yes
Exiv2 can write to Tiff: Yes
Exiv2 supports XMP metadata: Yes
LibCImg: 130
LibExiv2: 0.18.1
LibJPEG: 62
LibJasper: 1.900.1
LibKDE: 4.2.2 (KDE 4.2.2)
LibKExiv2: 0.6.0
LibKdcraw: 0.5.0
LibLCMS: 118
LibPNG: 1.2.27
LibQt: 4.5.0
LibRaw: 0.7.2
LibTIFF: LIBTIFF, Version 3.8.2 Copyright (c) 1988-1996 Sam Leffler Copyright (c) 1991-1996 Silicon Graphics, Inc.
Marble widget: 0.7.1
Parallelized demosaicing: No
LibGphoto2: 2.4.2
LibKipi: 0.4.0

-rei





On May22 17:30, Francisco Lor?s Ara wrote:
>    The same is true for me too. RAW files are about 12-15 MB, PNG files grow
>    > 50 MB!!!! I use a Canon EOS450D (12.2 Mp).
>
>    Regards,
>
>    Francisco

> _______________________________________________
> Digikam-users mailing list
> [hidden email]
> https://mail.kde.org/mailman/listinfo/digikam-users


--
Rei Shinozuka [hidden email]
Ridgewood, New Jersey

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[Micha? Smoczyk]

Hi,
I've just reinstalled my system and have fresh installation of KDE4
with digiKam 0.10.0 (SUSE KDE4 Factory repo) and *fresh* database of
photos which was build by digiKam from scratch and nothing was
imported from digiKam 0.9.x database.

I noticed that I've got many tags in IPTC written by 0.9.x versions
of digiKam in a way like:

tag/subtag/subtag2
tag2/subtag3/subtag4

and digiKam 0.10.0 writes every tag in separate line:

tag
subtag
subtag2

etc.

Maybe nothing wrong, but "slashed" tags are not shown in photos
preview nor in tag tree tab in the right panel. And, what is most
unexpected, I CAN'T search photos in those "slashed" tags - using
digiKam's search tab in the left panel, I am not able to find those
photos. Not slashed tags are correct and I can find photos tagged
this way. So it looks like digiKam doesn't see its own tags written
by previous versions...

Did you guys noticed the same behaviour and is it worth of bug
report in KDE bugzilla?

--
Michal, admin [monkey] nocnyrzepin [dot] net
http://www.nocnyrzepin.net


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