| From: | David McMinn |
| Date: | 10 Aug 2001 at 11:43:32 |
| Subject: | [amiga-c] Re: "transparent" colors |
--- In amiga-c@y..., Marcin Kielesi�ski <misterq@c...> wrote:
> "PDTA_MaskPlane (PLANEPTR) -- Pointer to a bit plane suitable for
> use with BltMaskBitMapRastPort(), or NULL if the picture has no
> transparent colours."
>
> My question is: what is a "transparent" colour?
It depends on the image format I guess. ILBM's usually have colour 0
as a transparent colour, so you'd get a mask which would only allow
pixels with a non-zero palette index to pass through. I think you can
set it to be any specific palette index with GIF's, so you'd get a
mask which allows any other pixel to pass through. PNG is similar I
think.
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