[magick-users] convert gif to png, and lost transparency

[zentara]

On Fri, 19 Dec 2008 10:53:10 -0500
zentara <zentara1 at sbcglobal.net> wrote:

>On Fri, 19 Dec 2008 08:43:16 -0700
>Bob Meetin <bobm at dottedi.biz> wrote:
>
>>~/Desktop/imagemagick> convert powerlogo.gif powerlogo.png
>>~/Desktop/imagemagick> ls -l power*
>>-rw-r--r-- 1 panic panic 5279 2008-12-19 08:38 powerlogo.gif
>>-rw-r--r-- 1 panic panic 4797 2008-12-19 08:39 powerlogo.png
>>~/Desktop/imagemagick>
>>
>>I looked at the images and the png has retained transparency. Can you put up a link to what you got back, perhaps use identify to check the version of Imagemagick?
>>
>Hi, I'm using the latest IM 6.4.7-4
>and your simple convert gives me a grey background in the png.
>
>Why Perl works, and convert dosn't, I don't know why?
>
>zentara

After a bit of experimenting I found this convert syntax works:
     
        convert powerlogo.gif -transparent black  output-shell.png

but this dosn't, it gives a black bg
        convert powerlogo.gif -transparent-color black  output-shell.png
 and 
        convert powerlogo.gif output-shell.png
gives a grey bg

Using IM 6.4.7-4  on linux, compiled from source.

zentara

-- 
I'm not really a human, but I play one on earth.
http://zentara.net/Remember_How_Lucky_You_Are.html