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TheFosterHouse
TheFosterHouse
Known Participant
March 3, 2023
Question

Premultiplied Alpha previews

  • March 3, 2023
  • 1 reply
  • 694 views

Bridge seems to be interpreting footage that has an alpha channel with what appears to be a Straight Alpha instead of a Pre-multiplied Alpha. You can see what it looks like in the preview window versus what it's supposed to look like. The file info in Bridge says the Alpha Mode is Pre-multilpied. "Show Transparency" and "Show Transparency Grid" don't change anything. This makes it very difficult to search for items when I can't see what the footage actually looks like. Not sure if this is a bug or needs a feature request. 

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    1 reply

    K
    Adobe Employee
    krnirmalkr
    Adobe Employee
    March 10, 2023

    Hi, 

    Thank you for your feedback. 

    Could you please share the following details for us to further understand this issue. 

    1. Bridge version 

    2. Operating system details. 

    3. Could you share any sample images with us at sharewithbr@adobe.com

     

    Regards, 

    Bridge Team

    TheFosterHouse
    TheFosterHouseAuthor
    Known Participant
    March 10, 2023

    Bridge version 12.0.2.252 (this is issue has been ther for as long as i can remember.)

    Windows 10 Pro. version 21H2, Build 19044.2604

    The issue is usually with .mov files with embeded alpha channels. that are ususually encoded using PNG at millions+alpha. I have seen this in image sequences using PNG as well. I have noticed that when a folder is opened there is usually about a second where the icon for each item is displayed correctly, but then the it gets updated to use the incorrect alpha mode. 

     

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