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Gowator
Titel:   BeitragVerfasst am: 06.07.2006, 14:12 Uhr



Anmeldung: 12. Mar 2004
Beiträge: 275
Wohnort: Paris-France
JimC hat folgendes geschrieben::
Just to be clear... Gimp is limited to 8 bit editing.

But, David Coffin's dcraw.c can output a 16 bit image for editing when used as a standalone program. It defaults to an 8 bit .ppm file. But, you have command line switches available to output a 16 bit linear .psd file or a 16 bit linear .ppm file.

Cool - thanks I hadn't tried that....
Zitat:

16 bit versus 8 bit isn't really what gives ACR an advantage for some high dynamic range scenes. They just have some pretty sophisticated algorithms designed to try and extract highlight detail, even when some of the photosites used in the demosaic/interpolation process have maxed out values.

Probably, just be give my background I worked most of my life with scientific software from writing to project management and user support.

One huge area is seismic image analysis which is way more complex that the photo side in terms of data size and complexity and seimic processing is a science all by itself....

bac in the good ole days it was analogue and then went to 8 bit aquisition of summed data then to time series aquisition .. etc. etc. until now its usually 64 bit mutliphase and terrabytes of data per survey.

A decent proportion of the worlds fastest 100 super computers are given over to this task... and there is a LOT of money involved....

I spent a decent amount of time designing processing algorithms and display algorithms working on datasets but although the algorithms make a huge difference you can't change what is not there.

The process itself is rather iterative, the best tool remains and will probably continue to be the human eye so usually you process and display ... refine the algorithms and reprocess from a fixed point but once you demultiplex the data you have demultiplexed it... and usually the raw data is so large it is kept in tape libraries and only loaded onto bulk storage as needed ....

Basically what I am trying to say is that the latter processes depend a lot on the former processes in terms of demultiplexing but the latter processes can't be done until you demultiplex ..

So what tends to happen is in terms of photography you tend to do the raw conversion and apply various algorithms with supplied parameters and using libraries such as camera color curves etc. but in most cases if you understand the algorihtms you can actually see artifacts of the earlier processing which you can then apply corrections or alternate algorithms for.... so the whole thing is very visual and being able to tweak paramters and get a near instantaneous processing chain probably is important too?
 
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JimC
Titel:   BeitragVerfasst am: 06.07.2006, 14:35 Uhr



Anmeldung: 16. Mar 2005
Beiträge: 219

Gowator hat folgendes geschrieben::
So what tends to happen is in terms of photography you tend to do the raw conversion and apply various algorithms with supplied parameters and using libraries such as camera color curves etc. but in most cases if you understand the algorihtms you can actually see artifacts of the earlier processing which you can then apply corrections or alternate algorithms for.... so the whole thing is very visual and being able to tweak paramters and get a near instantaneous processing chain probably is important too?


Not being able to easily tweak parameters and preview their impact quickly can be a weakness of the standalone version of dcraw.c versus some of the commercial products around.

So, you may need to change parameters you pass to it for optimum results using trial and error for some images. I've even been known to tweak some of the parrameters in the code, recompiling for best results. lol

Because David's algorithms are more complex than most, it can be slower to process, too (and because his code is not processor or operating system specific, how it's compiled enters into the equation).

There are some products that use David's code that do give you more flexibility to make changes (via a GUI), though. UFRaw is one popular open source product using David's algorithms for the demosaic piece, while adding a lot of features including some camera specific curves.

Rawstudio is another one I've been keeping an eye on (although I haven't tried it yet)

Edit/P.S.

You can pass more than one raw filename to convert at a time via the command line dcraw.c program, and it also supports the "as shot" white balance for many cameras. That way, you've got a better starting point for editing.

Just use the -w switch and it will look at the rgb multipliers in the metadata associated with white balance. For example (substituting your own image file names for pictxxxx.xxx), adding any other desired switches (type dcraw without any parameters and you'll see the available options)

dcraw -w pict0001.mrw pict0002.mrw pict0003.mrw pict0004.mrw

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Jim C.
 
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JimC
Titel: EXIF viewer plugin for Firefox  BeitragVerfasst am: 09.07.2006, 13:48 Uhr



Anmeldung: 16. Mar 2005
Beiträge: 219

One tool I rely on with Windows XP is Opanda IEXIF

It allows me to "right click" on a photo and see the embedded EXIF, if it's there (so I can see more information about an image including camera settings used).

Since I'm a moderator on a Digtal Camera Forum, it's one of my most frequenlty used tools. When users have problems, we often ask them to post sample images, and it lets me see where they went wrong with their settings without the need to download the image to check the EXIF.

Well, when I've used Linux distros in the past, I didn't have this tool. But, I remember a similar tool being mentioned before that's cross platorm, and I just finished installing it in Firefox a few minutes ago.

It doesn't have the details that I'm used to (it's missing ISO speed, flash on/off, Exposure Compensation Settings, White Balance Settings, Focus Information and things like manufacturer specific maker notes).

But, it does give you some basic information about an image (focal length, aperture, shutter speed, metering mode).

So, anyone that works with images online a lot may want to give it a try.

http://ted.mielczarek.org/code/mozilla/fxif/

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Jim C.
 
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4444
Titel:   BeitragVerfasst am: 19.07.2006, 07:56 Uhr



Anmeldung: 12. Apr 2006
Beiträge: 3

Great,

but I am looking for a tool that will be able to change
that info as well. I know there is a few for windows
(AtributeMagic Pro) but do you know of a Linux software
that can modifiy/erease the EXIF?

That will be nice.
 
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titan
Titel:   BeitragVerfasst am: 24.07.2006, 08:21 Uhr



Anmeldung: 07. Mai 2005
Beiträge: 526
Wohnort: Waliser Märze
Digikam 9 beta is in Sid repro today and it says

full support for 16bit images in the image editor, all image plugins have been ported to make use of the new 16 bit infrastructure.

Ian
 
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JimC
Titel:   BeitragVerfasst am: 25.07.2006, 00:51 Uhr



Anmeldung: 16. Mar 2005
Beiträge: 219

Yep... They announced that a while back, but it was not very clear if everything was supported as 16 bit or not. As of version 9, remaining issues supporting plugins, etc, from 8 to 16 bit *should* be resolved.

I'm still trying to find a Linux Desktop I can live with (trying too many distros lately). As soon as I settle on one (debating between SimplyMEPIS 6.0 final and Kanotix 2006-easter-rc4 using the UP kernel), I'll try to take some time to test image editing solutions.

I've been going back and forth between them over the past couple of weeks (trying a few other distros in between).

In any event, I'm confident that a Linux solution is possible (including full color management using available tools). It's just a matter of what Linux distro I'm going to be comfortable using. MS can kiss my you know what.

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Jim C.
 
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titan
Titel:   BeitragVerfasst am: 25.07.2006, 09:03 Uhr



Anmeldung: 07. Mai 2005
Beiträge: 526
Wohnort: Waliser Märze
JimC hat folgendes geschrieben::
Yep... They announced that a while back,

I'm still trying to find a Linux Desktop I can live with (trying too many distros lately). .


Jim,

I was just saying that it was now in the Debian repros. As for trying lots of distros, well that is the beauty of Linux but you may well end up confused and it is to a certain extent non-productive. Any distro can be made to look identical to another so you can configure any distro to give the desktop you like. What is more important is what is under the hood, how easy it is to configure, update, install software, how stable, what is support via the forums like etc. I know you have had problems with fonts but that is resolvable. Meppis is using Ubuntu repros, I think this is a backward step and may posiblly exclude using software from a lot of Debian repros. For example Digikam 9 beta is in Sid but is it avallable for Ubuntu/Meppis. I notice there is a lot less press about Ubuntu lately, maybe more people are seeing it's limitations.

Look forward to your comments on the latest Digikam.

Ian
 
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JimC
Titel:   BeitragVerfasst am: 25.07.2006, 19:20 Uhr



Anmeldung: 16. Mar 2005
Beiträge: 219

Ian:

Actually, I have been trying a LOT of distros over the past couple of years.

My short list usually includes Kanotix and SimplyMEPIS.

I'm actually running under Ubuntu right this minute (I haven't spent much time with the Gnome interface), and just finished installing a lot of extras using Automatix.

I solved the fonts problem. It had to do with web sites coded to use Microsoft Fonts. The standard msttcorefonts does not include some of the fonts that were being used by some web sites I frequent often. So, by installing missing fonts, the problem was solved.

Right this minute, Kanotix 2006-easter.rc4 (using the UP kernel) holds the record for the longest I've ever used a Linux Distro without rebooting into Windows. Smilie The default kernel was not stable on my PC and wouldn't work with my Belkin USB Wireless G Adapter (RT2570 chipset), but the UP kernel worked quite well.

But, I want to give SimplyMEPIS 6.0 Final and Ubuntu and good workout, too before I stop playing around with various distros.

To be frank, SimplyMEPIS is the most attractive to me, because it requires the least amount of work to get everything working for me (and I like the "look and feel" of it's default desktop much better than most). It's also the easiest distro to install I've ever used (by a long shot). My wife has been running under it for quite a while now (one version or another), although I did switch her back to Windows briefly last year due to problems with a new printer.

But, I haven't decided on a distro for full time use yet.

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spacepenguin
Titel:   BeitragVerfasst am: 03.08.2006, 22:27 Uhr



Anmeldung: 10. Dez 2004
Beiträge: 597
Wohnort: Schleswig-Holstein
Does there exist a successor for gexif? It really had nice features like manipulating the exif entries and the thumbnail.

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Linux-Userin #213445
LastFM-Musikstatistik für Kanoten
Kanotix, siduction, Kubuntu, antiX
 
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h2
Titel:   BeitragVerfasst am: 08.08.2006, 21:06 Uhr



Anmeldung: 12. Mar 2005
Beiträge: 1005

There's an article on linux raw image editing in linux.com that might be of interest to some people.

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Read more on dist-upgrades using du-fixes-h2.sh script.
New: rdiff-backup script
 
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