On 02/10/2013 05:04 AM, Erik Krause wrote:
Am 10.02.2013 09:56, schrieb Gnome Nomad:
Hmm, have never had LZW compress a 16-bit TIFF and make it LARGER than
the uncompressed version.
Just tested here with single-layer TIFFs converted from 48-bit RAW files
(6MP image):
8-bit TIFF: 17.2 MB (uncompressed) => 6.1 MB (LZW)
16-bit TIFF: 34.4 MB (uncompressed) => 30.7 MB (LZW)
Interesting. I have this all the time. Could it be photoshop LZW
compression is less good?
I doubt that. Photoshop would use the same LZW algorithm everyone else does.
However, try the following: don't denoise in
the raw conversion step and sharpen the image, then try to save LZW
compressed again. Images compress better if there are less fine details.
I didn't denoise them or sharpen them. They were ISO100 images from my
DSLR, and have no discernible noise. One reason I use TIFF files is they
don't lose fine details, or possibly express them as JPEG artifacts.
I think you'd have to walk through the LZW compression algorithm itself
to see where it's not being as successful with 16-bit TIFF as it is with
8-bit, if that's what you're focusing on.
--
Gnome Nomad
gnomeno...@gmail.com
wandering the landscape of god
http://www.clanjones.org/david/
http://dancing-treefrog.deviantart.com/
http://www.cafepress.com/otherend/
--
--
You received this message because you are subscribed to the Google Groups "Hugin and
other free panoramic software" group.
A list of frequently asked questions is available at:
http://wiki.panotools.org/Hugin_FAQ
To post to this group, send email to hugin-ptx@googlegroups.com
To unsubscribe from this group, send email to
hugin-ptx+unsubscr...@googlegroups.com
For more options, visit this group at http://groups.google.com/group/hugin-ptx
---
You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to hugin-ptx+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
