Canon 5d4 and blue skies

Timeless15 · Feb 15, 2019

I have a Canon 5d4 for about a year now. While on vacation I noticed when doing landscape photography when there is clear blue skies I'm getting some kind of digital noise in the graduations of the sky. I tried different lens and settings with no luck of getting rid of it. If anyone can help I would appreciate it.

Thank you

House

boldcolors · Feb 19, 2019

Dr_Jon said:
henrikbengtsson said:

OP shot in JPEG so no need to think about LR version

Click to expand...

Okay, so if the OP started with a JPEG and pushed it around in Lightroom I totally understand why the sky fell apart...

(JPEG compression working by throwing away stuff it thinks you won't see, so modifying a JPEG can quickly run into issues as the data you want to bring into visibility isn't there.)

I agree

pauljames34 · Feb 20, 2019

The library module shows the low res JPEG from the raw, and doesn't load the raw file up for display.

I've also noticed that if you have a second monitor up in library module it shows jpeg in main monitor and full res from raw on monitor two, but the other way round in develop mode, which I always thought a bit strange (and annoying sometimes!), it should show full res from raw in both.

pauljames34 · Feb 20, 2019

I bet LR5 still uses the embedded preview in the library module.

Graham Meale · Feb 20, 2019

MitchAlsup said:
have you ever looked, carefully, and scientifically, at the sky? you will see scintillation and waviness even in the clearest blue pristine skies.

Methinks you need to make an appointment with your optometrist.

Sara Valentine · Feb 20, 2019

The blue channel only has a quarter of the area on the sensor for light collection, so the SNR is not as high and lot more estimating gets made for the blue values of neighboring pixels.

Blue skies in daylight will almost always have noise in them when exposing according to the matrix metering and using in-camera settings for WB and JPEG processing.

J A C S · Feb 20, 2019

Come on, those heavy artifacts are not created by the Bayer sensor. The OP first needs to explain how he processed this image.

Sara Valentine · Feb 20, 2019

J A C S said:
Come on, those heavy artifacts are not created by the Bayer sensor. The OP first needs to explain how he processed this image.

Underexposed sky, nuclear boosted levels, output to JPEG. 'Nuf said.

Jon555 · Feb 21, 2019

It seems the OP may have manipulated the JPEG in an old version of Lightroom (long before 5D4 support). Certainly when I looked at the EXIF it said it was written by Lightroom and the OP said they were working with JPEGs.

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Canon 5d4 and blue skies

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