Hi Lynn,
Identify verbose should have some lines indicating channel depth,
there should be one called alpha:
Channel depth:
gray: 8-bit
alpha: 1-bit
I have written a one line script to tell me the bit depth of the alpha
channel from the output of identify -verbose. If there is no alpha,
nothing is printed out.
identify -verbose file.png | perl -pe 'while(<STDIN>){ if(/^\s.*alpha:
(\w+)-bit/){print "$1";}}'
Luke
On Tue, May 13, 2008 at 4:01 PM, Walton, Lynn <[EMAIL PROTECTED]> wrote:
> Hi Ralf and others,
>
>
> > This should work with every png file with an alpha channel.
> > Ralf
>
> Sorry to be a pain, but would you happen to be able to tell me the way
> with ImageMagick to be able to tell if the png file has an alpha
> channel?
>
> I've been studying all the ImageMagick references I can find, but
> haven't found it yet.
>
> Of the info in identify -verbose, I don't know which would be the most
> reliable indicator?
>
> Thanks,
> Lynn
>
>
>
>
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