Hello,
I have been seeing artefacts on some exported images and reading this
thread made me realise that they only appear when using AMAZE demosaicing,
but not with PPG - see sample of 100% crop;
DSC_0717-AMAZE.jpg -
https://drive.google.com/file/d/0B9klmXRD14TceVVTZUlfeFp3SDQ/edit?usp=sharing
I only see the artefacts with blown highlights. Is this a known issue with
AMAZE?
Regards,
Colin
On Sun, Dec 22, 2013 at 10:26 PM, Rodney Heyd <[email protected]> wrote:
>
>
>
> On Sun, Dec 22, 2013 at 2:48 PM, Tobias Ellinghaus <[email protected]> wrote:
>
>> Am Sonntag, 22. Dezember 2013, 14:14:58 schrieb Rodney Heyd:
>> > Hi,
>>
>> Hello,
>>
>> > I'm noticing that noise is being introduced into some images I've been
>> > working on during export from darktable. This is happening on the 1.4
>> > release candidate built for Fedora 19 (I also had similar results under
>> v
>> > 1.3). The output format doesn't seem to matter either, tiff, jpg, png
>> all
>> > have the same problem. Any idea what is going on here?
>> >
>> > Export parameters are min/max = 0, intent = perceptual, profile = sRGB,
>> and
>> > no additional style applied in export.
>> >
>> > Here's some sample files:
>> >
>> > 100% crop from the exported jpg
>> > darktable-export-crop.jpg<
>> https://docs.google.com/file/d/0Bz22rEgDUSPrQjQxZ
>> > ERWcFRINjg/edit?usp=drive_web>
>> >
>> > Screenshot of roughly the same region from within darktable (also at
>> 100%)
>> > darktable_screenshot.jpg<
>> https://docs.google.com/file/d/0Bz22rEgDUSPrWXM5cE
>> > 1FUEZIWEE/edit?usp=drive_web>
>> >
>> > Original raw file:
>> > 20131124_0289.ORF<
>> https://docs.google.com/file/d/0Bz22rEgDUSPrdFhRbWhoaWZHd
>> > G8/edit?usp=drive_web>
>> >
>> > Sidecar:
>> > 20131124_0289.ORF.xmp<
>> https://docs.google.com/file/d/0Bz22rEgDUSPraFRKcm5vL
>> > UtVYjQ/edit?usp=drive_web>
>> >
>> > Thanks! All help would be greatly appreciated.
>>
>> You are using amaze in that image. What is your setting for "demosaicing
>> for
>> zoomed out darkroom mode" in the core options of the preferences?
>>
>> And does it go away if you use PPG instead of amaze?
>>
>>
>>
> Ah, that's it! The core option was set to bilinear. If I set it to
> "full" then the noise appears, but PPG and bilinear seem ok.
>
> Thanks!
>
> Rod
>
>
>>
>> Tobias
>>
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>
>
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