[PD] pd/gem per-pixel image manipulation

[Martin Leopold Grödl]

IOhannes,
thank you very much, that trick with [repack] fits nicely. ;) still 
beginning pd, you see... and i'm already starting to love that zexy 
library ;)

thx again,
martin



IOhannes m zmoelnig schrieb:
> Martin Leopold Grödl wrote:
>> hi marius & others,
>> thanks for pointing me to glsl, i will have a look!
>>
>> but for now i think i found what's causing the trouble:
>> actually i want to apply per pixel manips continuously on a stream of 
>> pixes. eg. video from pix_film. so i was constantly triggering 
>> pix_dump with the gemhead. when triggering pix_dump manually it works 
>> fine.
>> (see attached test-patch)
> 
> 
> the problem you are experiencing is, that [pix_dump] will output an 
> empty list (aka "bang") the first time it is called (no image yet at its 
> input)
> 
> the bang will be distributed down your "processing" chain, and 
> eventually, in [* 0.5] it will be converted into a number "0" which will 
> be the first element in your [repack 100], thus introducing an offset.
> 
> the most naive workaround is to filter the bang with a [route bang].
> 
> apart from that: why do you manually unwrap the lists? [repack 1] will 
> do just as well.
> and for scalability, you should dynamically size the [repack 100]
> 
> 
> (see attached patch)
> 
> 
> 
>>
>> i know it's not very efficient to do it like that in the first place 
> 
> indeed, it is not...:-)
> 
> 
> fgmasdrö
> IOhannes
>