Can someone please explain to me 'alpha channels'

Discussion in 'Design and Graphics' started by tonywalker23, Jun 14, 2008.

  1. tonywalker23 macrumors regular

    Dec 21, 2003
    Im trying to submit a webapp for my site to apple. i know very little about graphics and i keep getting an error when i try to upload an icon.

    "Icon image upload does not contain a recognized alpha channel, please correct image."

    can someone please explain to me what i need to do.


    Attached Files:

  2. IgnatiusTheKing macrumors 68040


    Nov 17, 2007
    das Fort
    An alpha channel is a way to make part of the image transparent by masking the part of the image you want to make invisible.

    In Photoshop, creating an Alpha Channel is as easy as selecting the part of the object you want to see and using the Save selection as channel option in the Channels palette. In Preview, you can use the Instant Alpha tool (hold down the Select button in the tool bar and choose it from the drop-down).
  3. candyman macrumors regular

    Aug 1, 2007
    Phoenix, Arizona
    Although the software is outdated here, this link may help as the process itself has not changed.

    Photoshop Alpha Channel

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