Lightroom png rendering weird

  • 1
  • Problem
  • Updated 2 years ago
With the update to 2015.6, I can now see PNG files in Lightroom! This is great.

But it seems like transparency is applied to some normally text when viewing the file.

I have tested this with another of your product, Photoshop 2015.0.0, and PS work as intended (tested with different backgroud colors just to be sure).


Original PNG (Firefox with white background seems like it does the same has LR)




Comparaison JPG file with LR on the left and Irfanview on the right.




I have put the original image here in case :
http://www.racineimagine.com/ORIGINAL-CartouchesDansImprimante201608.png
I'll leave it there one year from now.

Thanks!
Photo of Alexandre Racine

Alexandre Racine

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Posted 2 years ago

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Photo of Simon Chen

Simon Chen, Principal Computer Scientist

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Official Response
The difference in the PNG rendition is due to the handling of transparency in the PNG. The default Photoshop PNG handler flattens the alpha channel. No alpha channel is present in the result doc, whereas Lr (and Adobe Camera Raw) still preserves the alpha channel. Lr mattes the transparent pixels (that shows the missing text) white for the rendition, which gives the appearance that the transparent text is missing. This is the same way that Lightroom matte the missing/transparent pixels when you apply a severe lens/perspective distortion to a photo. Lightroom fills the missing/transparent pixels with white.

Being a non-destructive image editor, Lr still preserves the original PNG with the alpha channel intact. This is as-designed behavior.
(Edited)