[PD] GEM: displaying Pictures on MIDI Keyboard events, pix_image vs. pix_multiimage
Max Neupert
abonnements at revolwear.com
Mon Oct 11 17:39:22 CEST 2004
hi peter/list,
okay, i am trying to use pix_multiimage now instead. it seems that i
still do something wrong, although the console does not tell me
anything about it.
max
Am 11.10.2004 um 15:12 schrieb Peter Todd:
>> as far as i understood the help patches i should use pix_imageInPlace
>> instead of pix_image because of better performance.
>> i do not get the usage of pix_imageInPlace it does not really work for
>> me, where is the problem?
>
> OK, it looks like [pix_multiimage] works a bit more like [pix_image],
> only without the need to load them from disk each time, as they are
> all loaded into RAM.
>
> [pix_imageInPlace], on the other hand, loads the images to texture RAM
> (and as such is not used with the [pix_texture] object, as this is
> already done). As such, these images cannot be processed with
> subsequent [pix_*] objects
>
>> i was comparing the performance of LZW compressed tiffs and
>> uncompressed ones, and had the impression that without compression it
>> runs a bit better. do you agree?
>
> At a guess, when you load the compressed images to memory (of
> whichever sort), the computer decompresses them (so that the image in
> memory is uncompressed). If you are using [pix_image], it would need
> to do this often, whereas with the other objects it would only happen
> once when you load them. So, when you get things working with objects
> other than [pix_image], by this logic, it would no longer make any
> difference wether the images were compressed. I think.
>
> I've not actually directly used these objects significantly, though,
> so this is a bit speculative.
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