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DxO analyzer software

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edwin_sn said:
anyone use this? how is it?
Click to expand...
Old post, but I have also found the DxO website, read all the information about their software and I must say it sounds impressive. I will wait until they come out with the 350D update before I download the trial version, but was wondering if anyone uses it and how well does it work? Any information would be appreciated.

http://www.dxo.com/en/photo/home/default.php

Thanks
--
http://www.pbase.com/ericj071

See my profile for equipment list.

'The best place to find a helping hand is at the end of your own arm.' -Swedish Proverb

EricJ ([email protected])
 
As long as they continue to penalize pro camera users by charging them a much higher price for the same software, I will not have any interest in their software.
 
I use DxO with my 300D and really like the results. I shoot a lot of art and architecture, including panoramas made up multiple images stictched together, so correcting optical distortions is essential. I'm less impressed with the sharpening, which sometimes over-sharpens at the default setting, in my opinion, but you can control this. I use it with the 17-40, 50 1.4, and 70-200 f4. If you have lower end lenses, I expect you will probably be even more impressed by the improvements.

However, DxO is expensive, and to correct optical distortions and vignetting, you can also use PTLens (stand alone app or photoshop plugin), which is free: http://epaperpress.com/ptlens/

One difference is that PTLens' distortion correction is done assuming the lens is focused at infinity. Distortion changes at close distances, so it will not be perfect in this case. DxO does take the distance of the subject into account, and when this info is included in the EXIF, it does all this automatically, which is great. BUT, Canon appears to have decided to prevent such automation by not including distance data in the EXIFs written by their recent cameras. See this thread:
http://forums.dpreview.com/forums/read.asp?forum=1031&message=12982543

In this case, the approximate distance of the subject needs to be entered in DXO for each image in order to get the best results, which is tiresome. You can use a default setting of infinity for all images, which is exactly what PTLens does.

I don't know whether the 350D includes distance data in EXIFs, but my guess is that it doesn't.
 
Bob Glass said:
I use DxO with my 300D and really like the results. I shoot a lot
of art and architecture, including panoramas made up multiple
images stictched together, so correcting optical distortions is
essential. I'm less impressed with the sharpening, which sometimes
over-sharpens at the default setting, in my opinion, but you can
control this. I use it with the 17-40, 50 1.4, and 70-200 f4. If
you have lower end lenses, I expect you will probably be even more
impressed by the improvements.

However, DxO is expensive, and to correct optical distortions and
vignetting, you can also use PTLens (stand alone app or photoshop
plugin), which is free: http://epaperpress.com/ptlens/
One difference is that PTLens' distortion correction is done
assuming the lens is focused at infinity. Distortion changes at
close distances, so it will not be perfect in this case. DxO does
take the distance of the subject into account, and when this info
is included in the EXIF, it does all this automatically, which is
great. BUT, Canon appears to have decided to prevent such
automation by not including distance data in the EXIFs written by
their recent cameras. See this thread:
http://forums.dpreview.com/forums/read.asp?forum=1031&message=12982543
In this case, the approximate distance of the subject needs to be
entered in DXO for each image in order to get the best results,
which is tiresome. You can use a default setting of infinity for
all images, which is exactly what PTLens does.

I don't know whether the 350D includes distance data in EXIFs, but
my guess is that it doesn't.
Click to expand...
Thanks for posting this info Bob, that was exactly the kind of input I was looking for.

Now does anyone know how to check and see if the distance data is stored in the exif data of the 350D?
--
http://www.pbase.com/ericj071

See my profile for equipment list.

'The best place to find a helping hand is at the end of your own arm.' -Swedish Proverb

EricJ ([email protected])
 
You can check it with the free Irfanview viewer.
http://www.irfanview.com/

Along with the app, make sure you install the plugin that allows it to read EXIF data. Then open an image that is straight from the camera (not post processed), select image> information, click on EXIF info, then scroll down to the maker notes section and look for subject distance. The value appears in mm in 300D images.

Also be sure you are using a lens that supplies distance data. A list of lenses that do and don't is here (although it doesn't seem to include some of the lastest canon lenses):
http://photonotes.org/articles/eos-flash/#distancedata

Let us know what you find out.
 
Bob Glass said:
You can check it with the free Irfanview viewer.
http://www.irfanview.com/
Along with the app, make sure you install the plugin that allows it
to read EXIF data. Then open an image that is straight from the
camera (not post processed), select image> information, click on
EXIF info, then scroll down to the maker notes section and look for
subject distance. The value appears in mm in 300D images.
Click to expand...
Tried Irfanview and was unable to get it to show exif info in crw and cr2 files, even after downloading all the plug-ins.

But I was able to use ExifPro and find the data, the 300D crw showed subject distance and the 350D did also using ExifPro.
Bob Glass said:
Also be sure you are using a lens that supplies distance data. A
list of lenses that do and don't is here (although it doesn't seem
to include some of the lastest canon lenses):
http://photonotes.org/articles/eos-flash/#distancedata

Let us know what you find out.
Click to expand...
--
http://www.pbase.com/ericj071

See my profile for equipment list.

'The best place to find a helping hand is at the end of your own arm.' -Swedish Proverb

EricJ ([email protected])
 
I didn't know about the focused at infinity issue.
Bob Glass said:
However, DxO is expensive, and to correct optical distortions and
vignetting, you can also use PTLens (stand alone app or photoshop
plugin), which is free: http://epaperpress.com/ptlens/
One difference is that PTLens' distortion correction is done
assuming the lens is focused at infinity. Distortion changes at
close distances, so it will not be perfect in this case. DxO does
take the distance of the subject into account, and when this info
is included in the EXIF, it does all this automatically, which is
great. BUT, Canon appears to have decided to prevent such
automation by not including distance data in the EXIFs written by
their recent cameras. See this thread:
http://forums.dpreview.com/forums/read.asp?forum=1031&message=12982543
In this case, the approximate distance of the subject needs to be
entered in DXO for each image in order to get the best results,
which is tiresome. You can use a default setting of infinity for
all images, which is exactly what PTLens does.

I don't know whether the 350D includes distance data in EXIFs, but
my guess is that it doesn't.
Click to expand...
 
Hmmm, interesting. I used Ifranview to look at the EXIF on 300D jpegs, didn't try it with raw files. So the 350D raw files really include subject distance data? That's really going to annoy 20D owners who use DxO.

However, I downloaded some of Phil's sample 350D jpegs (at the end of his review) and for those the subject distance value is always 0, regardless of the subject location. I guess that could because the lenses he was using don't communicate subject distance, although I'd be surpised since they are both recent designs, the EF-S 17-85 IS and 70-300 DO.

Can you shoot some jpegs and see if you get values in the subject distance field for them?
 
Hi,

Can you tell me what lens you used with the 350D to get subject distance in the EXIF data? I'm assuming subject distance is the tag we want for DxO? My 350D seems to report 0 subject distance for all my lenses, even though this information is present in equivalent 10D files.

Maybe Canon are deliberately suppressing this data with their latest cameras, maybe hiding it in encrypted form, for their own use only. If this is the case, then I hope someone reverse engineers a solution to this soon.

If Canon are hiding this data, then I think this would be an ethically dubious action, and an abuse of their dominant position in the industry, even if potentially commercially advantageous for them - for example if they are planning to produce their own lens correction software at some point.

Or maybe Canon just want to stop cheaper third party lenses getting such good software corrections that they can rival expensive Canon lenses!

A more innocent explanation may be that the data is so inaccurate (judging by some of the wacky values I've observed in the past) that they don't want people using it!

Fred
 
Bob,

I just took a jpg image with my 350D & Canon 24-70mm f/2.8L and in the exif info from ExifPro the subject dist was 0, must only work with raw files?? Very stange.
Bob Glass said:
Hmmm, interesting. I used Ifranview to look at the EXIF on 300D
jpegs, didn't try it with raw files. So the 350D raw files really
include subject distance data? That's really going to annoy 20D
owners who use DxO.

However, I downloaded some of Phil's sample 350D jpegs (at the end
of his review) and for those the subject distance value is always
0, regardless of the subject location. I guess that could because
the lenses he was using don't communicate subject distance,
although I'd be surpised since they are both recent designs, the
EF-S 17-85 IS and 70-300 DO.

Can you shoot some jpegs and see if you get values in the subject
distance field for them?
Click to expand...
--
http://www.pbase.com/ericj071

See my profile for equipment list.

'The best place to find a helping hand is at the end of your own arm.' -Swedish Proverb

EricJ ([email protected])
 
Hi,

I'm using ExifPro with my 350D and it shows subject distance as 0 in the EXIF from both jpgs and crw files. Can you tell me how you found the distance info for the crw files in case I'm doing something wrong.

Thanks,

Fred
 
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