Canon G15 - Distorted and blurry HDR in Lightroom CC

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  • Updated 3 years ago
Hello,

I'm using a Canon G15 and discovered the following problems with the new HDR function of LR 6/CC:
I've set the image aspect ratio to 3:2 on the camera and use RAW files. Lightroom imports the images correctly with a crop to 3:2, but if I create a HDR, the resulting HDR is a 4:3 image that is squashed to 3:2. In the example I attached, which was created from five exposures (I know that two are enough for LR ;-)), I noticed a second problem:
The usage of the luminance noise reduction on the HDR leads to an extremely blurry images, even with low values around 25. I used 100 for the screenshot to illustrate it better. Normally I use values not higher than 25-50 on single shots, but even that made the HDR image look very blurry compared to single shots. If I reset the development settings for the single exposures, they are displayed as 4:3. But if I create a HDR after that, the images are stretched horizontally to 3:2. I did another try with disabled GPU suppport - same result. I've uploaded the five shots for testing purposes to www.traumnarben.de/download/canon_g15...
The only workaroud for me is to export the images to TIFF and use an external HDR-Software, which gives great results. I also own the Canon S95, which I use for stereoscopic photography. Italso has a 4:3 chip, but the HDRs are processed properly from 3:2 images and luminance noise reduction works fine.

Best regards,
Christoph





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Christoph Müller

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Posted 3 years ago

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Steve Sprengel, Champion

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I'm seeing what you're seeing regarding the crop with your G15 images: LR's HDR seems to scrunch the entire 4:3 pixel area into the 3:2 crop area, squishing it down a bit.

You can expand the crop area to the full frame using Original instead of As Shot for your crop area, but LR still squishes things vertically. LR is supposed to ignore the crop and then reapplying the first image's settings to the resulting HDR but it seems LR is confused which crop is supposed to be applied, As Shot or Original, and is even resizing the pixels to fit one inside the other.

I am also seeing the excessive NR, and even more worrying than the LR NR is the excessive Color NR with a default of 25. To me it seems that the maximum Color NR should be about 2 with your resulting HDR not 25 which smears colors way too far and removes any color in the flowers.

Since both Lum and Color NR seem to have a wider range, perhaps it is supposed to be that way, since there can be excessive amounts of noise in deghosted areas.
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Christoph Müller

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Thanks for your reply, Steve!

I don't think that the effect of the noise reduction is supposed to be that way. Even if I set the deghosting to none, the noise reductions leads to extremely blurry results. I don't have this effect on images from my S95. Maybe it has something to do with the ISO?

However, thank you very much! Ich hope there's a solution for the problem, which is obviously a bug.

Best regards!
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Steve Sprengel, Champion

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I don’t mean the NR is responding to the deghosting being applied, I just mean that if you use deghosting the darkest image can sometimes be brightened to match the surrounding area of other images and as such the noise is reasonably severe and Adobe may have increased the sensitivity of the NR sliders to handle this, but if you're not seeing the same thing for another camera's HDR then maybe it is an anomaly.
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Steve Sprengel, Champion

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When you're comparing NR sensitivity of other cameras make sure the exposure range and scene brightness range is similar, otherwise it may just be something about that particular HDR.