[Bug 221985] New: update histogram before preview

https://bugs.kde.org/show_bug.cgi?id=221985

           Summary: update histogram before preview
           Product: showfoto
           Version: 1.0.0
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: [hidden email]
        ReportedBy: [hidden email]


Version:           1.0.0 (using KDE 4.3.4)
OS:                Linux
Installed from:    Gentoo Packages

If it is possible, it would be great if the histogram would get updated
instantly, while a RAW file's preview is being calculated when tweaking it in
showfoto. My system is old, but I assume that even on an entry level system the
preview will still take at least a second to calculate, and when you work on a
lot of photos each second adds up. If the histogram would get immediately
updated, we could often not care about waiting for a preview when its apparent
from the histogram that something's wrong, and we'd carry on tweaking till the
histogram is right, then wait for the preview.

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[Marcel Wiesweg]

https://bugs.kde.org/show_bug.cgi?id=221985


Marcel Wiesweg <[hidden email]> changed:

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--- Comment #1 from Marcel Wiesweg <marcel wiesweg gmx de>  2010-01-10 14:24:40 ---
With the histogram calculated from image data, how do you want to update the
histogram without the corresponding image?

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=221985





--- Comment #2 from Gilles Caulier <caulier gilles gmail com>  2010-01-11 08:49:31 ---
Perhaps DrSlony want mean about to record histogram in metadata. PNG support
this feature as a dedicated chunk, but not Exif, IPTC, and XMP.

This can be done in a dedicated XMP tag from digiKam namespace for example...
But this tag will be only managed by digiKam of course. Editing image in gimp
for example will not update histogram XMp tag.

Gilles

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["Jens Müller"]

https://bugs.kde.org/show_bug.cgi?id=221985


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--- Comment #3 from Jens Mueller <tschenser gmx de>  2010-01-11 09:56:49 ---
From my understandings DrSlony means that a optimal workflow would be:

1) load raw file and create full histogram of that image data
2) move histogram values according to sliders on the fly (without doing a new
raw development)
3) if the slider stops start a new fullsized raw processing in background and
if finished update preview and histogram from that data

For example dxo (one of the best raw developer out there, but proprietary) work
like that.

As digikam do not dive deep into raw decoding, but compute histogram data on
top of an existing image, this is at least not trival to archive.

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[DrSlony-3]

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DrSlony <[hidden email]> changed:

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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

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[Gilles Caulier-4]

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Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
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   Version Fixed In|                            |2.6.0

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           What    |Removed                     |Added
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          Component|general                     |showfoto
            Product|showfoto                    |digikam

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--- Comment #4 from DrSlony <[hidden email]> ---
Using digiKam-5.0.0 on a laptop, histogram update is fast enough. Agreed to
keep it closed.

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         Resolution|INVALID                     |FIXED

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   Version Fixed In|2.6.0                       |5.0.0

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