3 Replies Latest reply on Oct 15, 2011 5:09 AM by Rick Gerard

    using 16 bit and 32 bit composition setting

    Cris is Bliss Level 1

      Its a little confusing to me on How you are supposed to use 16 and 32 bit.  If you created your comp and effects in the 8 bit mode (and all effects work in 8 bit mode right) and you have banding issue that you want to smooth out so you switch to 16 bit but then some of your effects have that Yellow Warning.  Do you switch to 16 bit  then switch back to 8 and the 16 bit stuff is saved or do you have to pre render while in 16 bit and import the render file into the 8 bit.  It's not clearly explained.   why don't them make all the plugins to work in 16 and 32 bit.

       

      Thanks in Advance

      On a Mac using CS4

        • 1. Re: using 16 bit and 32 bit composition setting
          Rick Gerard Adobe Community Professional & MVP

          Use the Effects>Utilities>HDR Compander before an effect has the 32bit warning set to compress range, then you use it after the effect set to expand the range. A more complete explanation in in the Help Documents. Look Here for that info.

          • 2. Re: using 16 bit and 32 bit composition setting
            Cris is Bliss Level 1

            the explanation is a little confusing.  So if your effects stacking order is: 2 low dynamic range effects followed by a HDR effect and followed by 2 more LDR effects you would have a total of 4 instances  of the HDR Compander effect with each pair sandwiching the LDR or would you just have one pair of the HDR Compander sandwiching the whole stack?

             

            Reading the complete explanantion it make me wonder if its a good idea because of the trade off.  Do you use this often? or should it be avoided when possible.

            Thanks

            • 3. Re: using 16 bit and 32 bit composition setting
              Rick Gerard Adobe Community Professional & MVP

              I always wrap effects that require compression and expansion with the HDR compander. If your project requires that you insert an 32 bit effect between two lower bit effects then you would have 4 instances as you suggest. There is no trade off. The Compander returns the dynamic range to the pipeline so that the advantages of the higher bit rates are maintained.

               

              If you do not use the HDR compander then everything in the render pipeline after the first instance of an effect has a bit depth warning will only be processed using 8bit color.