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White dots (pixels?) when zooming in

philip brosens
  • Edited

I took a photo of a church against a dark sky - metering for the highlights.  In post I pulled up the shadows, but then when zooming in from around 33% a lot of white pixels show up.  The more I zoom in the worse it gets.  These pixels stay when exporting the image as a jpeg. 

When watching the jpeg version made by the camera into C1 there are no white pixels visible.

Hardware acceleration is disabled.

I recently bought the camera and I'm still getting to know it, but the fact that it's only the raw file in C1 that shows these artefacts so clearly baffles me. Before I had the D750 and I never noticed such things.

Any suggestions ? Iso too high ?  Do I have a problem with my camera sensor ??

Underneath there is a screenshot of part of the photo .

The photo was taken at iso 5000 - 1/40 sec -  f/4

Thank you for any suggestions.

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Comments

4 comments

Date Votes
  • gb

    Maybe download one of the other free or trial raw programs out there to see if it really is a C1 issue?

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  • philip brosens

    Thank you for your reply.

    I have been doing some testing in the last couple of days.  I almost exclusively use C1, but I also have ON1 and DXO and the free NIkon software NX-D.  With those programs if I pull up the shadows quity heavily noise appears (grain) - which seems normal to me - but there are no white dots.  This is unique to C1.  A zoomed in image is really ugly to look at.

    I thought it was maybe just something in the preview image, but after exporting the image as a jpeg the dots remain.

    I'm under the impression that it is worse with the newest update of C1 than with the previous C1 20 version.

    I have also made night shots with the Pentax K1 and there the image is ok.  So I thought it must be either C1 doing something weird to the image or a problem with my camera.

    I contacted customer support, but they haven't really given me a solution.  All drivers are updated - and since the K1 image is ok it seems odd to me that it would be a problem of graphics card.

     

     

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  • gb

    If you could find some other D750 raws online to process in CO, that might rule out the camera or CO.

    Otherwise I would keep hassling customer support. Provide sample shots.

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  • Adam Johnson

    I am having a similar issue.  I recently updated to the latest version of C1 as well. I am having an issue with hot pixels when I export a small jpeg suitable for social media.  When I process a full size jpeg the hot pixels are not there.  

    I shoot concerts and push my images all the time.  Never had an issue with hot pixels showing up at any point.  The only time I'd see them is when you first load the image in C1 and zoom in, they flash by real quick.

    I'm using a 2019 MacBook and gfx50s.

    Any ideas?

     

     

     

     

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