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Anonymous
May 19, 2018

P: Banding in previews

  • May 19, 2018
  • 13 replies
  • 457 views

When I convert images to B&W, with some of the Adobe-supplied B&W profiles I see a lot of pixelated banding in the sky of standard previews (when in loupe view after pressing the 'E' key).

Rebuilding the preview doesn't help.

The only workaround is building a 1:1 preview, either by zooming in or by giving the command to build a 1:1 preview. I can then discard the 1:1 preview and still have a clean standard preview.

The preview quality level in the catalog settings is of no influence. My previews are set for 2880 pixels, which exactly matches my screen.

I'm using LR Classic 7.3.1 on a 2017 15" MacBook Pro (2.9 Ghz i7, 16GB RAM, Radeon Pro 560 w/4GB RAM) running MacOS 10.13.4 with both images and catalog on the local SSD.

Files are .RAFs from a Fuji X-T2. I'm seeing this with at least Adobe-supplied profiles BW 02 and BW 03.


Screendump of portion of screen before building 1:1 preview


Roughly the same portion of the screen after building and discarding 1:1 previews.

Is this normal behavior, am I doing something wrong, or is this a bug?

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    13 replies

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    Ian Lyons
    Community Expert
    Ian LyonsCommunity Expert
    Community Expert
    May 22, 2018
    I suspect his a known and longstanding issue that the new B&W exacerbate profiles. Try increasing Color Noise to +70%
    V
    Adobe Employee
    Venkatesh Penjuri
    Adobe Employee
    May 22, 2018
    Hi Emile, Thanks for bringing this to our notice. I am seeing this issue too. We will look into this.
    Venkatesh PenjuriAdobe Lightroom Team
    A
    Anonymous
    May 21, 2018
    Same happens with Canon 5D Mk III RAW's. Upper right portion of the screen, BW 03 applied:


    Banding in the sky after building standard previews but before building 1:1 previews


    After building (and discarding) 1:1 previews, the standard preview in loupe view looks good and has no banding.

    Anyone else see this?

    Edit: it's not a huge problem per se, but the banding also shows up in slideshows and I'd rather not work around everything by building and discarding 1:1 previews.
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