Attached Link: http://www.p-gallery.net

Hi,

Most of the post processing process are scale dependent. Suppose I apply a mere "sharpen" filter. What it usually does for each pixel is to substract a fraction of the surrounding ones (at least I think). When doing this, the contrast is increased.
The trouble is that this process is scale dependent, ie the surrounding pixels at 640x480 won't be at the same place in a 64000x48000 render (there will be 100 pixels between them). So the sharpen mask WON'T act the same on images of different size. An if this effect will probably be hardly noticeable with a sharpen mask, it can be spectacular for other postprocessings.
What would be interesting would be to know if there is a way to avoid this, ie to be sure that your high resolution image will look the same that the one you post on a website.

This problem is imho a major downside of (heavy) post-processing.

Regards

Samuel