Re: Resize filters

On Mon, May 23, 2011 at 02:20:43PM -0500, Bob Friesenhahn wrote:
> On Mon, 23 May 2011, [email protected] wrote:
>>>
>>> What resize API function are you invoking and what parameters are you
>>> passing?
>>
>>
>>    image2=ResizeImage(imgstruct->image, x, y, filter, 1.0, &exception);
>
> This seems reasonable.
>
>> is what I've got currently. I'm experimenting w/ all the resizing
>> facilities atm and some are working well, others are not (Resize,
>> Thumbnail cause segfault); I don't know what extra preparation is required
>> by me.
>
> Segmentation faults are likely your fault.  However, it is wise to  
> invoke InitializeMagick(NULL) at the start of your program.

InitializeMagick() was done. That the segfaults would turn out to be
my fault wouldn't be surprising, but it's not yet obvious to me what
needs repair.

>> Perhaps at this point, you could tell me: what is the relationship
>> between ImageInfo and Image? I'm keeping them together currently, but in
>> my (brief) experience so far, it seems ImageInfo is mostly (only?) used
>> to bootstrap loading an image.
>
> Right.  ImageInfo is primarily used to pass settings for when the image 
> is not available yet.  There is some documentation on the various types 
> to be found at "http://www.graphicsmagick.org/api/types.html".  And of 
> course the documentation for ResizeImage may be found at  
> "http://www.graphicsmagick.org/api/resize.html#resizeimage".

OK -- thanks for the confirmation. I've got a few pages of GM docs
open, including a sample C program, all of which I'm using to guide my
work. I'll keep at it.

Thanks again for your help,

-bch

> Bob
> -- 
> Bob Friesenhahn
> [email protected], http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

-- 
Brad Harder
Method Logic Digital Consulting
http://methodlogic.net/
http://twitter.com/bcharder


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