Fred,

It didn't occur to me to use just "-flatten" without "+matte".  Does 
-flatten remove the alpha channel or just set it to completely opaque?

Thanks,
Dave

Fred Weinhaus wrote:
> try
>
> convert img-rgba.png -flatten img-rgb.png
>
> if that does not do what you want, then post a link to a correctly 
> processed version from GIMP.
>
>
>
>
>   
>> Hi all.
>>
>> I'm having some troubles when trying to convert a PNG image from RGBA to
>> RGB colorspace.
>>
>> convert img-rgba.png +matte img-rgb.png
>>
>> The original image is:
>>    http://mperillo.ath.cx/img-rgba.png  187K
>> and the converted one is:
>>    http://mperillo.ath.cx/img-rgb.png  109K
>>
>>
>> The same problem happens when I convert the image to JPEG.
>> I have tried the JPEG conversion using PIL (Python Imaging Library), and
>>   the problem is the same.
>>
>> However if I do the conversion to JPEG using Gimp, the resulting image
>> is correct.
>>
>>
>> What's the cause of the problem?
>>
>>
>>
>> Thanks   Manlio Perillo
>>     
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