[Bug 211625] New: Converting bulb RAW image produces unusable results

[Simon-2]

https://bugs.kde.org/show_bug.cgi?id=211625

           Summary: Converting bulb RAW image produces unusable results
           Product: digikam
           Version: unspecified
          Platform: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: [hidden email]
        ReportedBy: [hidden email]


Version:           1.0.0-beta6 (rev.: 1035699) (using 4.3.2 (KDE 4.3.2), Debian
packages)
Compiler:          cc
OS:                Linux (i686) release 2.6.31-4.slh.1-sidux-686

Just take a look. Totally unusable.

Original NEF file from Nikon D90
http://granjow.net/uploads/temp/DSC_1165.NEF

JPG converted with digikam
http://granjow.net/uploads/temp/DSC_1165digikam.jpeg

JPG converted with Nikon ViewNX 1.4
http://granjow.net/uploads/temp/DSC_1165nikon.JPG

Default settings. I did not mess up any curve or so in digikam.

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[Johannes Wienke-3]

https://bugs.kde.org/show_bug.cgi?id=211625


Johannes Wienke <[hidden email]> changed:

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                 CC|                            |[hidden email]
          Component|general                     |RAW files management




--- Comment #1 from Johannes Wienke <languitar semipol de>  2009-10-24 11:54:10 ---
What you see is the auto exposure feature. As a default this is switched on
when importing raw files. Try to switch it off and have a look at the converted
photo once again, please

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[Simon-2]

https://bugs.kde.org/show_bug.cgi?id=211625





--- Comment #2 from Simon <simon eu gmail com>  2009-10-24 11:58:40 ---
Yes, thank you! I just found it too this very moment.
http://granjow.net/uploads/temp/DSC_1165b.jpeg

I wonder whether one could make digikam clever enough to warn the user when
auto exposure might fail.

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[Johannes Wienke-3]

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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID




--- Comment #3 from Johannes Wienke <languitar semipol de>  2009-10-24 12:24:04 ---
But how would you define "fail"? The image was exposed but to your mind a bit
to much. ;)

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=211625


Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
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            Version|unspecified                 |1.0.0-beta6




--- Comment #4 from Gilles Caulier <caulier gilles gmail com>  2009-10-24 12:28:21 ---
You just to know how RAW Import tool work.

Anyway, RAW files always needs post processing jobs... It's not JPEG...

Gilles Caulier

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[Simon-2]

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--- Comment #5 from Simon <simon eu gmail com>  2009-10-24 12:57:50 ---
Johannes, by fail I mean that there is so much noise that it hurts my eyes and,
even more important, that the Moon is just some white undefinable white ugly
stain.
Should the Auto Exposure tool be allowed to make grey areas (Cirrostratus
clouds around the Moon) blank white? Imho no. If it does, it failed.
I was additionally astonished to see this result whileas the preview image
looks perfect.

Gilles, Yes, I know. Not every detail, but I basically know how RAW works. But
this overcorrection is kind of unexpected behaviour and I didn't assume the
Auto Exposure checkbox being guilty. Or perhaps I just didn't notice this
button before.

So ... what about disallowing the Auto Exposure tool to fail? :)

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--- Comment #6 from Johannes Wienke <languitar semipol de>  2009-10-24 13:06:19 ---
For the preview image normally an embedded jpeg in the raw file is used, that
was directly produced by the camera.

The auto exposure uses an algorithm that should work fine for normal landscape
scenes and so on but not for corner cases like your image with one really
predominant color. We (or the exiv2 developers) could spend a lot of time to
develop a heuristic that works good on those images or... you could simply turn
that feature off once and afterwards this setting is always restored so you
will never have to worry about this again ;)

Somewhere else was already a discussion if the auto exposure should be a
default setting or not. Maybe we could think about this once more.

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--- Comment #7 from Simon <simon eu gmail com>  2009-10-24 13:47:17 ---
Yes, perhaps.

Although imho it would not be that hard to get it working correctly in this
case too. Isn't it as simple as that? If a higher exposure makes some
percentage (or number) of pixels #fff (white) then it is too much. This should
also hold for landscape pictures.

I'm not sure whether in this case digikam is using the embedded image. I've got
a full-size picture there, as far as I can see (12 MP). Does Nikon embed a full
size JPG?

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--- Comment #8 from Johannes Wienke <languitar semipol de>  2009-10-24 13:55:01 ---
No, it's not that simple. For photos of landscape you have no problems with
some white pixels in clouds or if you took an image with backlight and want the
foreground to be visible and so on.

I don't have a Nikon, but eg. my Olympus camera includes an image with
something about 1400px on the longer side inside the raw file. You can decide
wether the digikam preview should use this included image somewhere in the
album view settings.

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--- Comment #9 from Simon <simon eu gmail com>  2009-10-24 14:01:44 ---
Oh, I see.
So then, perhaps, if 90 % of the image is dark, it likely isn't a landscape
pic.

If it is really too hard because images differ that much it perhaps would be
best to either switch the Auto Exposure off, as you suggested, or place an info
message somewhere if AE is on and some parts of the image became #fff.

«Embedded preview loads full-sized image»? Enabled, makes no difference.

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--- Comment #10 from Johannes Wienke <languitar semipol de>  2009-10-24 14:05:04 ---
For this purpose there is an overexpose indicator. Unfortunately it's not
working while raw development. I think we need to fix this.

It should make a difference if you use the simple image preview, not in the
editor. Or maybe NEFs don't have an embedded preview? I don't know that.

Gilles, do you have an idea about this?

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--- Comment #11 from Gilles Caulier <caulier gilles gmail com>  2009-10-24 14:16:30 ---
Preview is... preview, no more. Press F4 and you will see JPEG preview embedded
in NEF. Yes Nikon Embedded JPEG preview (more than one depending of NEF
version, but not the full image size i think)

All RAW files format use this technic to be able to display RAW on TV or on
camera screen without to demosaicing image data !

Raw import tool do not use this technic. It run on real RAW image data, not on
JPEG embedded image to display preview in this tool. In fact, Raw import will
always display Raw demosaicing result (worked to a 1/4 size of Raw image size -
feature from libraw)

Note : Exiv2 is not used there, but libraw...

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--- Comment #12 from Johannes Wienke <languitar semipol de>  2009-10-24 14:19:13 ---
(In reply to comment #11)
> Note : Exiv2 is not used there, but libraw...

Eh sure...

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           What    |Removed                     |Added
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            Version|1.0.0-beta6                 |1.0.0




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