Saving a bitmap with alpha channel

Discussion in 'Photoshop' started by Nollie, Aug 11, 2005.

  1. Nollie

    Nollie Guest

    I'm a programmer experimenting with bitmap manipulation. I'd like to
    implement bitmap tranparency. It's not too difficult to render, but it
    is difficult (for me) to save a bitmap with alpha data. I've been
    saving my images in .RAW format and manually adding the bitmap headers
    myself. There's got to be an easier way.

    I'd like to be able to save the bitmap using the ARGB format, and
    preserve the anti-aliased edges (and other tranparent stuff) that
    photoshop provides, but I can't seem to get it to work properly.
    Please help. TIA.
    Nollie, Aug 11, 2005
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  2. Nollie

    Nollie Guest

    Wouldn't ya know it. After spending hours with this problem, I
    discover the solution minutes after I post:$htn$

    In case the link doesn't work, here's the text:

    Some programs will treat a 32-bit bitmap as having an alpha channel,
    is this what you mean? Right click on your layer's thumbnail, click
    "Select layer transparency". Click the "Select" menu, click "Save
    selection...". Save it as a new channel in your picture (Call it
    whatever you like, I prefer "Alpha"). Save as bitmap, make sure "Alpha
    channels" is ticked.
    This may be version dependant, I use PhotoShop CS.

    Works like a charm!
    Nollie, Aug 11, 2005
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  3. Nollie

    Mike Russell Guest

    It's fine to answer your own posts - just don't complain about the answer
    being off topic. :)
    Mike Russell, Aug 11, 2005
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