[Digikam-users] (no subject) Bad embedded preview

[Anders Stedtlund]

Hi Nicola,

This is not a solution of any kind but a note on the preview issue.

I remember that I had problems with showing the same image, "Embedded
preview loads full-sized images"  unchecked or not. That is, always
the full image was shown. This was with my Canon CR2 raw files. I know
that someone else had the same problem, but don't know who.

I'm at the moment on digiKam/kipi-plugins 2.5.0, but I haven't checked
to see if that problem has been sorted out for me. Can't test right
now either.

It might be the same problem for you anyway, the DNG is not showing
the embeded preview.

/Anders

2012/5/3 Nicola Botta <nicola at pik-potsdam.de>:
> I apologize for the missing "subject" in my previous post. One more
> piece of information on the reported problem:
>
> The problem is *not* related to RAW decoding or DNG conversion
> whatsoever. As reported, RAW decoding works fine. I have not tried DNG
> conversion. Both the DNG and the JPG files I'm considering are straight
> from the camera. When I take pictures, I save both (built-in-camera)
> DNGs and JPGs files to the SD card.
>
> What is puzzling is that DNG thumbnail views looks fine but DNG previews
> (after double-click on the thumbnail) are terrible.
>
> My understanding is that thumbnail views and DNG previews (with
> "Embedded preview loads full-sized images" unchecked) should be
> renderings of the same JPG file (in-camera generated, embedded in the
> DNG file) and should look similar.
>
> Instead, previews seem to apply some sort of brightness auto-correction
> and such behavior does not seem to be avoidable with the configuration
> options available to users.
>
> This is very frustrating and, in fact, the only reason why I am looking
> for a digikam alternative.
>
> Best,
> Nicola
>
>
> Nicola Botta <nicola at pik-potsdam.de> wrote:
>
>> With
>>
>> Qt: 4.6.3
>> KDE Development Platform: 4.4.5 (KDE 4.4.5)
>> digiKam: 1.2.0
>>
>> and, more recently
>>
>> Qt: 4.7.4
>> KDE Development Platform: 4.7.4 (4.7.4)
>> digiKam: 1.9.0
>>
>> I have consistently experienced the same problem when working with DNGs
>> and JPGs generated by Ricoh GXR modules:
>>
>> For a given picture, the thumbnail views of both the DNG and of the JPG
>> files are fine. Import (RAW decoding) of the DNG file is fine too with
>> Auto-Brightness unchecked. The JPG preview is also fine but the DNG
>> preview often looks horrible.
>>
>> No matter whether "Embedded preview loads full-sized images" is checked
>> or unchecked, DNG previews often look quite different from their JPG
>> counterparts *AND* from from their raw decoding imports.
>>
>> In many cases, DNG previews look like raw decodings with Auto-Brightness
>> checked. It is as if brightness always was auto-adjusted in DNG
>> previewing.
>>
>> This is quite frustrating since it makes DNGs unusable for previewing
>> and forces me to save both DNGs and JPGs versions of the same picture.
>>
>> Any idea how to solve this problem ? Any help is highly
>> appreciated. Best, Nicola
>> _______________________________________________
>> Digikam-users mailing list
>> Digikam-users at kde.org
>> https://mail.kde.org/mailman/listinfo/digikam-users
>
> _______________________________________________
> Digikam-users mailing list
> Digikam-users at kde.org
> https://mail.kde.org/mailman/listinfo/digikam-users