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Activity Forums Adobe After Effects Set the Opacity lower than 1%

  • Set the Opacity lower than 1%

    Posted by Chris Marker on May 10, 2011 at 6:13 pm

    Hey Guys,

    hows it going?

    I need to set the opacity of a layer in AE lower than 1%, 0.1% to be exact…
    When i try to do that i jumps to 0%…
    Any ideas how to solve this?

    Thank you!

    Best,

    Chris

    Bartek Skorupa replied 15 years ago 2 Members · 1 Reply
  • 1 Reply
  • Bartek Skorupa

    May 10, 2011 at 7:06 pm

    In fact it didn’t jump to 0%. It is set to 0.1%. Click the value and you’ll see it’s set to 0.1%.
    The problem is that opacity means alpha. Alpha is one of the four channels that are R, G, B and Alpha.
    You can’t display colors (or alpha) with this accuracy. You are limited to 8 bits per channels.
    Possible values are zero and multiples of 1/255 = 0.39%.
    When using percentage you have minimum possible value of 0%. Next possible value is 0.39% and so on.
    When you set the value to something between 0% and 0.39% the closer possible value will be chosen.
    It means that if you set opacity to 0.1% – it’ll be “rounded” to 0%. If you set it to 0.2% – it’ll be rounded to 0.39%.

    Bartek Skorupa
    Warszawa, Poland

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