Help me understand matrix profiles (DNG camera profiles)

I'm guessing it's a fairly simple question, so please bear with me as I'm working my way round trying to understand the DNG format:
After the de-bayering step, are DNG camera profiles pure 3-channel mathematical curves? I know Adobe DNG editor allows for adjustments from the Color-checker patches & there's some hue sliders etc, but do these build into RGB curves, or is it some kind of additional mild LUT (or something else) applied over the top?
Thanks!
Bert

read here how DNG (dcp) profiles are guiding (or rather how info there is being used by a code) the color transform in Adobe converters = http://wwwimages.adobe.com/content/dam/Adobe/en/products/photoshop/pdfs/dng_spec_1.4.0.0.p dfутили
also Sandy Mc... utility is useful to peek inside dpc profiles data = dcptool.sourceforge.net
may be also the following link = Dcp or Icc Profile?
and do a search for posting from Eric Chan (madmanchan) and participants like VitNovak ... here and also forums like LuLa

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DNG Camera Profile vs. White Balance?

I'm having trouble understanding DNG Camera Profiles and haven't found a good explanation online. I understand that each camera or camera/lens combination will have some variations, and I understand the white balance process. But I haven't grasped the idea that I can create a usable profile using one or two ColorChecker shots in conditions that aren't tightly controlled. For example, if I create a DNG Camera Profile using my tungsten lights, how does that help correct photos shot using different slightly warmer or cooler lights? How does the profile taken at an unknown color temperature help correct for another color temperature? And (more fundamentally) how is what the DNG Camera Profiles do different from a white balance adjustment? Feel free to just point me towards an existing explanation. I've read a lot about camera profiles, but I still don't quite get it. Thanks.

See this Luminance Landscape thread about dual illuminant profiles:
http://luminous-landscape.com/forum/index.php?showtopic=43733
If you scroll down to where I (tlooknbill) posted Color Checker chart samples, you'll see the visual differences.
Your camera may deliver different results.

LR 4 and custom DNG camera profiles... they are not embedded?!

i have the colorchecker passport for some days.
my workflow:
import the .CR2 raw files from memorycard as DNG copy into lightroom.
create a DNG camera profile with the colorchecker passport (LR export -> xrite colorchecker).
then i choose the created camera profile and i set the whitebalance.
all working fine... as it should.
my problem is, i don´t want to have a hundred DNG profiles, i will sure create that much over the time, on my harddisk.
i think it´s messy and it´s also not very save to have the profiles only as separate files, in case you lose the profiles.
i thought the camera profile can be embedded INTO the DNG file.
i thought the camera profile is written into the DNG files when i write the metadata back into the files.. but it seems not.
it seems the DNG camera profile is only embedded into the DNG image file when i EXPORT the DNG file again with the LR export dialog.
for example:
i choose the camera profil "MY 5D MK2 PROFIL_1" for an image and then save the metadata back into the DNG image file.
then i delete the camera profile "MY 5D MK2 PROFIL_1" from harddisk.
the next time i open LR and select the same image ... the cameraprofile is reverted back to "adobe standard" and the profil i have created is gone.
when i EXPORT the image as DNG, then even after i have deleted the DNG cameraprofile "MY 5D MK2 PROFIL_1" from the hardisk.... the profil is still in the DNG image.
that´s what i want... but i have to export all files again as DNG files.
i would really like to get rid of this extra step.
i hope my english is good enough so you understand what my problem is.
can anyone share a light on this?
is this the only way to embedd the DNG camera profile or im doing something wrong?
intel i7 2600k, win7 64bit, 16 GB ram, LR 4 final.

possible.... but imho that can lead (at least in my case ) to problems.
in the case when you forget to update the DNG manually and delete the profiles (because you think they are already embeded via STRG+S).
or when you send them to someone without updating the DNG preview... i think that is unessesary complicating things without gaining a real benefit.. not?
afaik there is no filter option so you can create a smartfilter for images that need to be updated this way?

DNG camera profile - which to trust, Adobe's or X-Rite's?

I found that dual-illuminant DNG camera profiles created with X-Rite's ColorChecker application and Adobe's DNG Profile Editor give different visual results (the profiles were produced using the same set of 6500K/2850K illuminated photos). I'm now in trouble which profile(s) to trust, I assume Adobe's is correct...
Andreas

b2martin_a wrote:
I like the DNG Profile Editor better.
Me too. The purpose of the twisting is for more pleasing color. Cool dark greens, but warmer light greens; dark midnight blues, but warmer cyany light blues, deep dark reds, but warmer light reds...
Note: this exagerates what often happens in real life: shadows are cool, sunlit colors are warmer...
The linear profiles may be more accurate, but the twisted profiles may look better.
Obviously this is subjective, and may depend on the shot and the purpose for it...
My favorite profile is a customized version of Adobe Standard created with DNG Profile Editor - a little dimmer in the upper-midtones/lower-highlights, a little less cyany blues, a little cooler greens, and slightly warmer (less magenta-y) reds.
Rob

Looking inside of DNG Camera Profiles and editing them

For those interested in the insides of DNG Camera profiles, and how to edit them, I've written dcpTool.
dcpTool is a compiler/decompiler for DNG camera profiles (.dcp files). dcpTool can decompile binary format DCP files into an XML format for editing with a text editor or whatever, and then compile the XML format file back into a binary DCP file, as well as extract embedded profiles from DNG files. It runs on Windows and OS X command lines, and is based on V1.2 of the DNG SDK.
See here: http://dcptool.sourceforge.net/
Health warning: dcpTool is a command line utility - if you're not comfortable with command line stuff, dcpTool probably won't be of any interest to you.

Very cool, thanks for the info.

Feature Request: Opcodes in DNG Camera Profiles?

We now have V1.3 of the DNG spec, with support for opcodes, which is great.
Now, can we the ability to put opcodes in DNG camera profiles?
Given all the hard work has already been done to support opcodes, this would seem to me to be a really value adding thing to do. It would allow profiles to be created that support specific camera/lens combinations. E.g., it would allow the Leica M8's famous "Cyan corners" vignetting problem on uncoded wide ange lenses to be addressed by a profile rather than having to rewrite all the image's raw data.
Thanks,
Sandy

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Dear all, I need help with the colour profile of my photoshop CS6.
I've taken a photo with my Canon DSLR. When I opened the raw with ACDSee, the colour looks perfectly ok.
So I go ahead and open in photoshop. I did nothing to the photo. It still looks ok
Then I'm prompt the Embedded Profile Mismatch error. I go ahead and choose Discard the embedded profile option
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I'm prompt the Embedded Profile Mismatch error. I go ahead and choose Discard the embedded profile option
always use the embedded profile when opening tagged images in Photoshop - at that point Photoshop will convert the source colors over to your monitor space correctly
if your colors are wrong at that point either your monitor profile is off, or your source colors are not what you think they are - if other apps are displaying correctly you most likely have either a defective monitor profile or source profile issues
windows calibrate link:
http://windows.microsoft.com/en-US/windows7/Calibrate-your-display
for Photoshop to work properly, i recall you want to have "use my settings for this device" checked in Color Management> Device tab
you may want to download the PDI reference image to check your monitor and print workflows
and complete five easy steps to profile enlightenment in Photoshop
with your settings, monitor profile and source profiles sorted out it should be pretty easy to pinpoint the problem...

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Edited by: AmandaBaah on Feb 15, 2010 4:39 PM

If I future buy 10 shares in company at £1 per share - at the end of the day my potential value is £10
The next day the shares drop tp £0.9 per share - I have a negative position - my shares are only worth £9
I haven;t bought them yet - but I have a negative position - ie if things stayed as they are - I am going to realise (ie end up with) a loss
Now you can use this for loans and foreign exchange banks as well...

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>
I am a SQL developer, and need a little help to understand what clusters are. I never came across to create any cluster. Can someone plz help me with simple example, what is cluster and in which situation we create cluster?
>
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Hi,
Oracle Standard Edition 11.2.0.3.0 CPU Oct 2012 running on Windows 2008 R2 x64. I am using Oracle 10g syntax for WITH clause as the query will also run on Oracle 10gR2. I do not have a Oracle 10gR2 environment at hand to comment if this behaves the same.
Following query is beyond me. It takes around 2 minutes to return the "computed" result set of 66 rows.
SQL> WITH dat AS
2          (SELECT 723677 vid,
3                  243668 fid,
4                  TO_DATE ('06.03.2013', 'dd.mm.yyyy') mindt,
5                  TO_DATE ('06.03.2013', 'dd.mm.yyyy') maxdt
6             FROM DUAL
7           UNION ALL
8           SELECT 721850,
9                  243668,
10                  TO_DATE ('06.02.2013', 'dd.mm.yyyy'),
11                  TO_DATE (' 22.03.2013', 'dd.mm.yyyy')
12             FROM DUAL
13           UNION ALL
14           SELECT 723738,
15                  243668,
16                  TO_DATE ('16.03.2013', 'dd.mm.yyyy'),
17                  TO_DATE (' 04.04.2013', 'dd.mm.yyyy')
18             FROM DUAL)
19      SELECT /*+ GATHER_PLAN_STATISTICS */ DISTINCT vid, fid, mindt - 1 + LEVEL dtshow
20        FROM dat
21 CONNECT BY LEVEL <= maxdt - mindt + 1
22 order by fid, vid, dtshow;
66 rows selected.
SQL>
SQL> SELECT * FROM TABLE (DBMS_XPLAN.display_cursor (NULL, NULL, 'ALLSTATS LAST'));
PLAN_TABLE_OUTPUT
SQL_ID 9c4vma4mds6zk, child number 0
WITH dat AS         (SELECT 723677 vid,                 243668 fid,
            TO_DATE ('06.03.2013', 'dd.mm.yyyy') mindt,
TO_DATE ('06.03.2013', 'dd.mm.yyyy') maxdt            FROM DUAL
UNION ALL          SELECT 721850,                 243668,
   TO_DATE ('06.02.2013', 'dd.mm.yyyy'),                 TO_DATE ('
22.03.2013', 'dd.mm.yyyy')            FROM DUAL          UNION ALL
    SELECT 723738,                 243668,                 TO_DATE
('16.03.2013', 'dd.mm.yyyy'),                 TO_DATE (' 04.04.2013',
'dd.mm.yyyy')            FROM DUAL)     SELECT /*+
GATHER_PLAN_STATISTICS */ DISTINCT vid, fid, mindt - 1 + LEVEL dtshow
    FROM dat CONNECT BY LEVEL <= maxdt - mindt + 1 order by fid, vid,
dtshow
Plan hash value: 1865145249
| Id | Operation                              | Name | Starts | E-Rows | A-Rows |   A-Time   | OMem | 1Mem | Used-Mem |
|   0 | SELECT STATEMENT                       |      |      1 |        |     66 |00:01:54.64 |       |       |          |
|   1 | SORT UNIQUE                           |      |      1 |      3 |     66 |00:01:54.64 | 6144 | 6144 | 6144 (0)|
|   2 |   CONNECT BY WITHOUT FILTERING (UNIQUE)|      |      1 |        |     42M|00:01:04.00 |       |       |          |
|   3 |    VIEW                                |      |      1 |      3 |      3 |00:00:00.01 |       |       |          |
|   4 |     UNION-ALL                          |      |      1 |        |      3 |00:00:00.01 |       |       |          |
|   5 |      FAST DUAL                         |      |      1 |      1 |      1 |00:00:00.01 |       |       |          |
|   6 |      FAST DUAL                         |      |      1 |      1 |      1 |00:00:00.01 |       |       |          |
|   7 |      FAST DUAL                         |      |      1 |      1 |      1 |00:00:00.01 |       |       |          |
--------------------------------------------------------------------------------------------------------------------------If I take out one of the UNION queries, the query returns in under 1 second.
SQL> WITH dat AS
2          (SELECT 723677 vid,
3                  243668 fid,
4                  TO_DATE ('06.03.2013', 'dd.mm.yyyy') mindt,
5                  TO_DATE ('06.03.2013', 'dd.mm.yyyy') maxdt
6             FROM DUAL
7           UNION ALL
8           SELECT 721850,
9                  243668,
10                  TO_DATE ('06.02.2013', 'dd.mm.yyyy'),
11                  TO_DATE (' 22.03.2013', 'dd.mm.yyyy')
12             FROM DUAL)
13      SELECT /*+ GATHER_PLAN_STATISTICS */ DISTINCT vid, fid, mindt - 1 + LEVEL dtshow
14        FROM dat
15 CONNECT BY LEVEL <= maxdt - mindt + 1
16 order by fid, vid, dtshow;
46 rows selected.
SQL>
SQL> SELECT * FROM TABLE (DBMS_XPLAN.display_cursor (NULL, NULL, 'ALLSTATS LAST'));
PLAN_TABLE_OUTPUT
SQL_ID 1d2f62uy0521p, child number 0
WITH dat AS         (SELECT 723677 vid,                 243668 fid,
            TO_DATE ('06.03.2013', 'dd.mm.yyyy') mindt,
TO_DATE ('06.03.2013', 'dd.mm.yyyy') maxdt            FROM DUAL
UNION ALL          SELECT 721850,                 243668,
   TO_DATE ('06.02.2013', 'dd.mm.yyyy'),                 TO_DATE ('
22.03.2013', 'dd.mm.yyyy')            FROM DUAL)     SELECT /*+
GATHER_PLAN_STATISTICS */ DISTINCT vid, fid, mindt - 1 + LEVEL dtshow
    FROM dat CONNECT BY LEVEL <= maxdt - mindt + 1 order by fid, vid,
dtshow
Plan hash value: 2232696677
| Id | Operation                              | Name | Starts | E-Rows | A-Rows |   A-Time   | OMem | 1Mem | Used-Mem |
|   0 | SELECT STATEMENT                       |      |      1 |        |     46 |00:00:00.01 |       |       |          |
|   1 | SORT UNIQUE                           |      |      1 |      2 |     46 |00:00:00.01 | 4096 | 4096 | 4096 (0)|
|   2 |   CONNECT BY WITHOUT FILTERING (UNIQUE)|      |      1 |        |     90 |00:00:00.01 |       |       |          |
|   3 |    VIEW                                |      |      1 |      2 |      2 |00:00:00.01 |       |       |          |
|   4 |     UNION-ALL                          |      |      1 |        |      2 |00:00:00.01 |       |       |          |
|   5 |      FAST DUAL                         |      |      1 |      1 |      1 |00:00:00.01 |       |       |          |
|   6 |      FAST DUAL                         |      |      1 |      1 |      1 |00:00:00.01 |       |       |          |
26 rows selected.What I cannot understand is why the E-Rows is NULL for "CONNECT BY WITHOUT FILTERING (UNIQUE)" step and A-Rows shoots up to 42M for first case. The behaviour is the same for any number of UNION queries above two.
Can anyone please help me understand this and aid in tuning this accordingly? Also, I would be happy to know if there are better ways to generate the missing date range.
Regards,
Satish

May be, this?
WITH dat AS
            (SELECT 723677 vid,
                    243668 fid,
                    TO_DATE ('06.03.2013', 'dd.mm.yyyy') mindt,
                    TO_DATE ('06.03.2013', 'dd.mm.yyyy') maxdt
               FROM DUAL
             UNION ALL
             SELECT 721850,
                    243668,
                   TO_DATE ('06.02.2013', 'dd.mm.yyyy'),
                   TO_DATE (' 22.03.2013', 'dd.mm.yyyy')
              FROM DUAL
            UNION ALL
            SELECT 723738,
                   243668,
                   TO_DATE ('16.03.2013', 'dd.mm.yyyy'),
                   TO_DATE (' 04.04.2013', 'dd.mm.yyyy')
              FROM DUAL)
       SELECT vid, fid, mindt - 1 + LEVEL dtshow
         FROM dat
CONNECT BY LEVEL <= maxdt - mindt + 1
      and prior vid = vid
      and prior fid = fid
      and prior sys_guid() is not null
order by fid, vid, dtshow;
66 rows selected.
Elapsed: 00:00:00.03

Help me understand matrix profiles (DNG camera profiles)

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