On 06/11/2013 11:08 PM, Frederic Da Vitoria wrote:
2013/6/12 Gnome Nomad <[email protected]
On 06/11/2013 10:02 PM, Frederic Da Vitoria wrote:
2013/6/12 Gnome Nomad
On 06/11/2013 12:26 PM, Isaac Gouy wrote:
On Tuesday, May 1, 2012 12:16:20 PM UTC-7, Bruno Postle
wrote:
On Tue 01-May-2012 at 03:35 -0700, AlekseyM wrote:
>What library Hugin uses to create tiff files?
Maybe it is
possible to
>add some options to specify different tiff format?
It would be possible, but the alpha channel in the
enblend TIFF
output is useful since a lot of panoramas have
transparent
areas.
While I agree that it's useful to support alpha channel
(and
I've used
that masking capability with Enfuse), It seems that
image processing
software intended for photographers tends not support alpha
channel TIFF
even when it does support 48bit TIFF.
Image processing software intended for a broader audience,
intended for
illustrators, is more likely to support alpha channel TIFF.
For example, the free to use, Serif Photo Plus Starter
Edition,
opened
all the problem TIFFs and allowed them to be exported
as 24bit
or 32bit
TIFF.
DxO Optics Pro wouldn't open the converted 32bit TIFF
but did
open the
converted 24bit TIFF.
Unfortunately it seems very unlikely that the makers of
software for
photographers will be persuaded to support alpha
channel TIFF.
I understand that the conversion is possible with
ImageMagick but
as-well-as my reluctance to install all that stuff on
my Windows
install, even Ubuntu now shows a warning that
ImageMagick cannot be
authenticated (whatever that means).
Perhaps the better approach would be
yet-another-utility-program, based
on libtiff, which strips the alpha channel and could be
used after
Enblend or Enfuse?
Hmmm, Rawtherapee opens Hugin TIFFs with no problems or
complaints.
GIMP only complains about them being 16-bit per channel.
Haven't
tried opening one in Bibble 5/Aftershot Pro, but that is
software
intended for photographers.
Gimp 2.8.4 on Windows does not complain at all, as far as I can see.
Same version I have here, although I run it on Linux, not Windows.
Does it tell you that the input file has 16-bits per channel, GIMP
only supports 8-bits per channel, so it is dropping the other 8 bits
per channel? That's the GIMP "complaint" I'm referring to. GIMP
doesn't support 48-bit (3 16-bit channels). That's scheduled for GIMP 3.
I know that currently GIMP is still limited to 8 bits / channel. I only
meant that GIMP does not complain about the bit depth when loading a
48-bits image. Actually, I have looked everywhere for a mention of the
bit depth in Gimp but have been unable to find any. Gimp is very quiet
about this :-)
GIMP has stated that GIMP 3 will have full 48-bit color support,
including for all effects, filters, etc.
Photoshop has had 48-bit support for a long time now, since 48-bit color
is the professional photography standard.
The problem with transparency and digital photographs has been around a
long time. When JPG standard was defined, it didn't include
transparency. I think it's because the joint "photographic experts" take
"transparency" to mean a type of film image, not an attribute of a
photograph. ;-)
Does anyone know why we receive what look like TWO slightly different
list sigs like this at the bottom? Maybe someone could combine the two
and reduce the extraneous line count a bit?
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David W. Jones
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wandering the landscape of god
http://dancingtreefrog.com
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