Inderdaad, op dezelfde schaal bekeken heeft het bestand met hoogste resolutie de minste ruis! Bij het “default” PI rescale algolrithme zal de ruis bij het verkleinen juist verminderen. Dus daar is dan nog wat uitzoekwerk.
Dit is de uitleg bij de “default” rescaling:
“Auto Interpolation Mode
This mode is applicable to processes that can scale or resize images. The Mitchell-Netravali and Lanczos-3 interpolation algorithms are automatically selected as a function of the scaling ratio, independently for each axis:
Lanczos-3 is always used for transformations that involve upsampling or no scaling.
Lanczos-3 is also used for slight downsampling ratios, where Mitchell-Netravali cubic filters cannot be properly sampled (i.e., when the filter kernels become smaller than 5×5 elements).
Mitchell-Netravali cubic filters are used for the rest of downsampling operations.
We think that this automatic selection mode is appropriate for most geometric transformations. However, achieving the best results usually requires some testing work and experimentation to assess the best interpolation algorithm for each particular task.”
