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I have a problem that RasterResampler does not provide good enough quality when scaling down a raster. I have tried all the methods available but it is "far" from the quality I get if I do a rescaling with e.g. Irfanview, Pillow (python library) or Photoshop.

 

Are there any other tricks one can use to get better quality when rescaling with FME?

 

See this image where I scaled from 2308x2212 pixels to 512x512 pixels. The left image is what FME can give me with the best settings I found (Average 16)

The right image is downscaled with Pillow (python)

 

RasterResampler_quality 

Note how "pixelated" FME's result are. Compare for example the road markings.

One trick that I've heard of (mostly for upsampling) is to do it in multiple smaller steps rather than one big one. That would add additional processing overhead though 😐

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