[HDR-photo] http://www.hdrphotos.net
Rhommel Bernardino
rhommel at rogers.com
Mon Mar 26 09:16:53 EST 2007
Hello,
There's a new forum site for HDR:
http://www.hdrphotos.net
The site is really new and looking for site moderators/administrators right now
Please feel free to register and send an email to admin at hdrphotos.net if you want to be considered for moderator/administrator for the site.
Looking forward to see you there!
Thanks,
http://www.hdrphotos.net
----- Original Message ----
From: "hdr-photo-request at hdr-photography.com" <hdr-photo-request at hdr-photography.com>
To: hdr-photo at hdr-photography.com
Sent: Sunday, March 25, 2007 1:00:03 PM
Subject: HDR-photo Digest, Vol 4, Issue 21
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Today's Topics:
1. Re: Color shift when converting to HDR with Photomatix
(Royce Howland)
2. Re: new user yesterday (sultanofcognac at mac.com)
3. Re: Color shift when converting to HDR with Photomatix
(Geraldine Joffre)
----------------------------------------------------------------------
Message: 1
Date: Sat, 24 Mar 2007 13:51:15 -0600
From: Royce Howland <royce at cospring.com>
Subject: Re: [HDR-photo] Color shift when converting to HDR with
Photomatix
To: High Dynamic Range Photography <hdr-photo at hdr-photography.com>
Message-ID: <46058133.3080401 at cospring.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Jim Bell wrote:
> [...] It looks like maybe Photomatix is not interpreting the
> white balance in the metadata correctly. If I convert a nicely exposed
> RAW file into an HDR and then look at the original file vs the new HDR
> image, the result is always way too much yellow in the HDR. Any thoughts?
In my experience, the interpretation of white balance information varies
across different RAW converter engines. Photomatix uses an engine called
dcraw, and I'd expect any other dcraw-based application to convert the
same file with the same look in terms of WB. Likewise I would expect
Lightroom and Adobe Camera Raw to look the same since they both use the
same engine -- ACR. However different RAW converters like Capture One,
ACR/LR, Aperture, the camera vendor's software, etc. may look different
than Photomatix (and each other).
You can adjust the WB in Photomatix when blending multiple RAW files
together. However when doing "pseudo-HDR" processing of a single RAW
file there is no option to adjust the WB and what is used is the "as
shot" WB. In that case, if you prefer it to look different your best bet
is to convert the RAW in your favorite converter and feed a 16-bit TIFF
to Photomatix. We had a discussion here a few weeks ago about the
relative benefits of doing separate RAW conversion vs. using Photomatix
to process RAW's; if you search the list's archives you'll find it.
Note that there also may be some color management issues at work here.
The actual RGB numbers in an image may be interpreted according to
different color spaces by each different application, which may make
them look different when displayed to the screen. Photomatix Pro 2.4 has
begun to introduce some color management functionality, but it isn't
complete. In particular, when processing a single RAW file you can't
specify how to interpret the final RGB color primaries. Whereas when
merging multiple RAW files you get to choose between sRGB, Adobe RGB and
ProPhoto RGB.
In general, color management of HDR images is a dicey proposition
because most HDR image formats and software don't really support CM of
32-bit images. Depending on which files, color spaces, applications and
CM settings you're dealing with, even an identical file's colors may
look different. So you can't necessarily compare apples to apples
between Photomatix's display and other applications' displays.
Unless you always use sRGB for everything, you need to take final
versions of the images, assign the appropriate color spaces, and look at
them side by side in the same (ideally color managed) viewer application
to really tell the differences in color.
Royce Howland
Calgary, Alberta
------------------------------
Message: 2
Date: Sun, 25 Mar 2007 12:31:01 +0200
From: sultanofcognac at mac.com
Subject: Re: [HDR-photo] new user yesterday
To: High Dynamic Range Photography <hdr-photo at hdr-photography.com>
Message-ID: <3069F877-6869-499A-BB9F-3618649B9094 at mac.com>
Content-Type: text/plain; charset="us-ascii"
Great - thanks for the link. I've tried the plug-in version of the
pro version and am impressed. But, of course, a stand-alone version
for Mac doesn't exist.
Typical!
Johnny
***
Media Director
kfm Verlag
Multimedia publishing
Switzerland/France
On 24 mars 07, at 04:21, David Fischer wrote:
> From: David Fischer
>
> Just can't get rid of noise. Used to bother me. Then I found
> Noiseware (link below). Was mentioned in NAPP Magazine. Tried demo
> with watermarks. 2 minutes later I bought the program. It's THAT
> good. The way it will clean up the blue channel is not to be believed.
>
> So stop doing work-arounds to get rid of noise - try this program.
>
> www.imagenomic.com
>
> Good luck.
>
>
> From: Royce Howland <royce at cospring.com>
> Reply-To: High Dynamic Range Photography <hdr-photo at hdr-
> photography.com>
> To: High Dynamic Range Photography <hdr-photo at hdr-photography.com>
> Subject: Re: [HDR-photo] new user yesterday
> Date: Fri, 23 Mar 2007 18:08:42 -0600
> >Wayne Mason wrote:
> >>Hello-i need a little help here.I find i'm getting alot of noise
> >>on the finished product why is this??Yours,wayne.
> >
> >Wayne, some more information would help us comment on what may be
> >going on. What HDR software are you using, what settings are you
> >using with it? What kind of images are you feeding into the HDR
> >process, how were they exposed, what ISO was used, etc.?
> >
> >Royce Howland
> >Calgary, Alberta
> >
> >_______________________________________________
> >HDR-photo mailing list
> >HDR-photo at hdr-photography.com
> >http://www.hdr-photography.com/mailman/listinfo/hdr-photo
>
> Get a FREE Web site, company branded e-mail and more from Microsoft
> Office Live!
> _______________________________________________
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Message: 3
Date: Sun, 25 Mar 2007 07:08:39 -0500
From: "Geraldine Joffre" <hdr-photo at hdrsoft.com>
Subject: Re: [HDR-photo] Color shift when converting to HDR with
Photomatix
To: High Dynamic Range Photography <hdr-photo at hdr-photography.com>
Message-ID: <20070325120839.M62802 at hdrsoft.com>
Content-Type: text/plain; charset=iso-8859-1
On Sat, 24 Mar 2007 00:03:55 -0400, Jim Bell wrote
> I am converting single RAW files from my Canon Xti to HDR with
> Photomatix in the 16bit mode. I get a large shift of the white
> balance toward yellow. It looks like maybe Photomatix is not
> interpreting the white balance in the metadata correctly. If I
> convert a nicely exposed RAW file into an HDR and then look at the
> original file vs the new HDR image, the result is always way too
> much yellow in the HDR. Any thoughts?
Are you using a version earlier than 2.4 maybe? If yes, this may explain the
problem and upgrading should solve it. If not, then try to set the White
Balance to "Auto" instead of the default "As Shot". When converting a single
RAW into a pseudo-HDR image, the White Balance has to be set via the default
settings (under Preferences if you are on Mac, and "View->Default Option" if
you are on Windows).
Geraldine Joffre
------------------------------
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End of HDR-photo Digest, Vol 4, Issue 21
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