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Re: [PanoToolsNG] Re: Enfuse - alpha channel

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  • Jef De Becker
    Thanks to Erik Krause, Sacha Griffin and John Houghton for the quick replies... It s not plain sailing yet, but at least I now know where I am heading...
    Message 1 of 4 , Feb 24, 2008
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      Thanks to Erik Krause, Sacha Griffin and John Houghton for the quick replies...
      It's not plain sailing yet, but at least I now know where I am heading...

      Regards,
      Jef
      ----- Original Message -----
      From: Erik Krause
      To: PanoToolsNG@yahoogroups.com
      Sent: Sunday, February 24, 2008 8:55 AM
      Subject: [PanoToolsNG] Re: Enfuse - alpha channel


      On Sunday, February 24, 2008 at 7:25, Jef De Becker wrote:

      > I am new to the group, and hope this is the right way to search for help on
      > the problem that bothers me at the moment... I have been trying Enfuse, using
      > Erik Krause's droplet. I understand that the idea is to feed Enfuse files with
      > an alpha channel.

      An alpha channel can be used to explicitly exclude areas that
      shouldn't be used by enfuse without actually deleting them. However,
      if you pass images without alpha channel enfuse will display a
      message that no alpha channel is present and all pixels of the image
      will be processed.

      Which pixels will actually show up in the result image is decided by
      the enfuse algorithm depending on their well-exposedness, their
      saturation and/or their contrast (set by the parameters --wExposure
      --wSaturation and --wContrast).

      > Now, obviously, just clicking on the "create new alpha
      > channel" icon in Photoshop's channel pallette is not enough...

      An alpha channel basically is a black and white image with same size
      as and stored within the actual image file. At any pixel position
      there is a corresponding alpha channel pixel. enfuse looks at all
      such pixels and does not process an image pixel if the corresponding
      alpha channel pixel is black (zero). All other pixels will be
      included in the further processing.

      So if you want to exclude a region explicitely from processing, in
      photoshop click on the alpha channel in the channels palette, then
      use a hard brush and paint it black (will be overlayed red most
      likely). See f.e.
      http://graphicssoft.about.com/od/photoshop/l/bllps504h.htm

      You must save as TIFF with alpha channels if you want enfuse to read
      the files.

      best regards
      Erik Krause
      http://www.erik-krause.de






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