[Bug 266674] New: green grid in images imported from raw file (cr2)

https://bugs.kde.org/show_bug.cgi?id=266674

           Summary: green grid in images imported from raw file (cr2)
           Product: digikam
           Version: 2.0.0
          Platform: Unlisted Binaries
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: RAW files management
        AssignedTo: [hidden email]
        ReportedBy: [hidden email]


Created an attachment (id=57378)
 --> (http://bugs.kde.org/attachment.cgi?id=57378)
screenshot

Version:           2.0.0 (using KDE 4.6.0)
OS:                Linux

After importing a raw file (cr2), a greenish grid appears in the imported
image. screenshot attached.

Reproducible: Didn't try




OS: Linux (x86_64) release 2.6.35-26-generic
Compiler: cc

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[Marcel Wiesweg]

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--- Comment #1 from Marcel Wiesweg <marcel wiesweg gmx de>  2011-02-19 17:17:42 ---
Can you provide the original file somewhere? If you dont have webspace, send it
to me by private mail, I can upload to our test collection.
Then we can try to reproduce. Just as well, assuming this is a libraw problem,
Alex may want to have the image.

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[Gilles Caulier-4]

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Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
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                 CC|                            |[hidden email],
                   |                            |[hidden email]




--- Comment #2 from Gilles Caulier <caulier gilles gmail com>  2011-02-19 17:24:07 ---
Alex,

I CC you for info...

Gandalf,

Got to Help/Components Info and copy and paste here the contents...

Gilles Caulier

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Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|RAW files management        |libkdcraw




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--- Comment #3 from Gandalf Lechner <gandalf lechner univie ac at>  2011-02-19 17:49:41 ---
Here is the components info:

digiKam version 2.0.0-beta3
Exiv2 kann in JP2 speichern: Ja
Exiv2 kann in JPEG speichern: Ja
Exiv2 kann in PGF speichern: Ja
Exiv2 kann in PNG speichern: Ja
Exiv2 kann in TIFF speichern: Ja
Exiv2 unterstützt XMP-Metadaten: Ja
LibCImg: 130
LibClapack: internal library
LibExiv2: 0.21
LibJPEG: 62
LibJasper: 1.900.1
LibKDE: 4.6.00 (4.6.0)
LibKExiv2: 2.0.0
LibKMap: 2.0.0
LibKdcraw: 2.0.0
LibLCMS: 118
LibPGF: 6.09.44 - internal library
LibPNG: 1.2.44
LibQt: 4.7.0
LibRaw: 0.13.0-Beta3
LibTIFF: LIBTIFF, Version 3.9.4 Copyright (c) 1988-1996 Sam Leffler Copyright
(c) 1991-1996 Silicon Graphics, Inc.
Marble Widget: 0.11.0 (Stable Release)
Parallelisiertes Entfernen von Mosaikmustern: Ja
Datenbanktreiber: QSQLITE
LibGphoto2: 2.4.8
LibKface: 2.0.0
LibKipi: 2.0.0
LibOpenCV: 2.1.0
Libface: 0.1

I'll post a link to the raw file in a couple of minutes when it finished
uploading.

Gandalf

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--- Comment #4 from Gandalf Lechner <gandalf lechner univie ac at>  2011-02-19 18:00:47 ---
Here's the link: http://db.tt/bDwe1AX

I tried several files, and they all showed the same grid effect.

Gandalf

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--- Comment #5 from Alex Tutubalin <lexa lexa ru>  2011-02-19 18:06:20 ---
Gandalf,

dcraw_emu (LibRaw's test front-end) does not show any grid with default
settings.

What processing options do you use?

To be precise, I've tested with current LibRaw 0.13.1, not with -Beta3, but is
should be no sifnificant difference

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--- Comment #6 from Gandalf Lechner <gandalf lechner univie ac at>  2011-02-19 18:27:37 ---
I decoded the file in rawtherapee, no grid there. Then I played a little with
the parameters in digikam and it seems that switching "interpolate RGB as four
colors" (or similar, I'm guessing from the German translation here) on creates
the effect. If that option is switched off the grid disappears.

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--- Comment #7 from Alex Tutubalin <lexa lexa ru>  2011-02-19 18:49:19 ---
You dont need 'four color RGB' on cameras with equal green channels (e.g.
Canons).

It *may* be useful if green channels are different and you have 4x3 matrix
profile for your camera (either built-in in LibRaw or external profile)

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--- Comment #8 from Gandalf Lechner <gandalf lechner univie ac at>  2011-02-19 18:59:02 ---
(In reply to comment #7)
> You dont need 'four color RGB' on cameras with equal green channels (e.g.
> Canons).

I see, so I'll just switch that off. Even if four color RGB is not needed, the
grid was a little unexpected, though.

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--- Comment #9 from Alex Tutubalin <lexa lexa ru>  2011-02-19 19:07:24 ---
Yes, this is definitely a bug.

Anyway, four-color-rgb itself cannot produce this kind of grid. The problem is
due to incorrect interaction between four-channel-rgb and one of new noise
correction routines.

Could you please specify what noise suppression settings do you use?

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--- Comment #10 from Gandalf Lechner <gandalf lechner univie ac at>  2011-02-19 19:26:48 ---
> Could you please specify what noise suppression settings do you use?

I now tried all available noise reduction routines (none, wavelets, fbdd, cfa
line denoise, impulse denoise), and saw the gird with all settings. with fdbb
the whole image turns flashy pink, so the grid is pink as well.

However, playing with the chromatic aberration option, I got the impression
that it is this one which causes the grid when combined with four color RGB.

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--- Comment #11 from Marcel Wiesweg <marcel wiesweg gmx de>  2011-04-18 21:58:02 ---
Alex, anything we need to do here from the digikam side?

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--- Comment #12 from Alex Tutubalin <lexa lexa ru>  2011-04-19 05:41:25 ---
Marcel,

since LibRaw 0.13.1 the fbdd denoising is disabled if four-color-rgb is turned
on because of algorithm incompatibility.
So, problem is closed on 2011-02-15.

So, you may close this bug.

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           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED




--- Comment #13 from Gilles Caulier <caulier gilles gmail com>  2011-04-19 09:37:31 ---
Thanks Alex for the feedback.

Gilles Caulier

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           What    |Removed                     |Added
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   Version Fixed In|                            |2.0.0

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