Re: image offset

On 2019-07-11 14:30, Bob Friesenhahn wrote:
> On Thu, 11 Jul 2019, mick crane wrote:
>> 
>> the images are all over the place.
>> 
>> I think what I want is -repage to get rid of the offset.
>> I'm uncertain what the offset is supposed to do because same image 
>> with or without seems to make no difference in the viewer.
>> I'm not that good at Perl and need advice how to translate the gm 
>> instructions into Perl syntax.
>> where would I put "-repage" ?
>> I also don't know how the actual .png files are constructed and 
>> wouldn't mind a link to some resource that might help me understand 
>> how all these image files work.
> 
> It is interesting that PNG stores these offsets and that the offsets
> are sometimes used when the file is later used.
> 
> I am not completely certain, but it may be that if you first set the
> image 'gravity' attribute to 'Forget' or 'NorthWest' and then set the
> 'page' attribute to a geometry like "+0+0" you will achive success.
> This is based on reading the GetImageGeometry() code in magick/image.c
> and the SetAttribute() code in PerlMagick/Magick.xs pertaining to the
> "page" attribute.
> 
> Bob

I will try things you suggest with "stab in the dark" syntax.
It seems that the new images try to relate themselves to the parent 
image.
Whereas I want to say " you are free" and a thing in your own right.




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