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4.8K Points

Mon, Jan 9, 2017 4:36 PM

Lightroom web: Renders pictures with heavy adjustments poorly

when sharing an image with heavy development adjustments (in this case lightening up dark areas) the image in the web gallery reproducibly shows heavy rendering artefacts whereas the picture exported from LR doesn't show similar artefacts.

directly exported from LR:


picture downloaded from the web gallery (and how it is displayed in LR mobile):


seems that this rendering smart previews just fails in some situations.
So I suggest to distinguish between online galleries (showing a direct rendering of the picture) and smart previews for LR mobile (using smart previews).
Otherwise the per se very useful functionality of web galleries is in some cases not suitable for sharing images.

Responses

Adobe Administrator

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4 years ago

Can you share this gallery and post a link to it here so that I can view it natively?
 Adobe Photography Products

Quality Engineering - Customer Advocacy

216 Messages

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4.8K Points

4 years ago

Hi Rikk,

here is the link to the image:
https://adobe.ly/2iV9QSS
and here the entire gallery:
https://adobe.ly/2imUllw

if needed I can also provide the raw + xmp

Adobe Administrator

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Thank you. 
 Adobe Photography Products

Quality Engineering - Customer Advocacy

Adobe Administrator

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8.5K Messages

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121.6K Points

4 years ago

Thanks for sharing these examples, Arnold. 

The root cause of the rendered display artifacts is the nature of the Smart Preview.  When extreme adjustments are made to a Smart Previews, particularly those with very dynamic content, (bright lights and a very dark sky in this case) artifacts may appear. I suspect that if you were to allow those Smart Preview-edits to sync back to its original raw master file, that the rendering from the raw file wouldn't show the same artifacts? Have you attempted that? If so, what did you find?

This is a known issue when rendering from a Smart Preview. It just doesn't have the bit-depth to handle extreme adjustments like your original raw did. We are looking at solutions for this for the future. 

This may work as workaround for this, for any images where you might specifically need to use in this workflow, would be to upload the raw file either directly into Lightroom for mobile via the camera connect, or place the raw file into your mobile pipeline via Lightroom for web. In those two cases, having access to the raw, your radical adjustments may render much better than the Smart Preview synced from Lightroom for Desktop. You would need to test it to verify with your edits.
 Adobe Photography Products

Quality Engineering - Customer Advocacy

216 Messages

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4.8K Points

Thanks Rikk,

uploading the RAW according to your second suggestion by using LR for web I now get an flawless picture in the web gallery
https://adobe.ly/2jgqmPE
Interesting enough that in LR for mobile on my iPad the picture looks correct now whereas in LR for mobile on my Android phone (where I also applied the settings by copy paste) I still have the artifacts.

Thanks anyway

Adobe Administrator

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The foolproof option is to render the file in Lightroom for Desktop and export it as a JPEG, reimport it into your catalog, and then share from that. Of course that eliminates your desire to edit these types of images to completion in Mobile.
 Adobe Photography Products

Quality Engineering - Customer Advocacy

216 Messages

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4.8K Points

Another detail for clarification: no artifacts after uploading the raw per LR for web on any devices viewing the modified image. But artifacts on the phone where I pasted the modifications to the raw.