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Question

RasterResampler - Problem with quality when downsampling

  • June 28, 2023
  • 1 reply
  • 13 views

krisvesweco
Contributor
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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.

1 reply

redgeographics
Celebrity
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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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