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Can you suggest me a good downsampling algorithm for an image. I explored area averaging method, but I am looking for better. I am using good in the sense that it should be less computational expensive and output image should be good by look and free from aliasing, checkboard effect etc.

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  • $\begingroup$ What downsampling algorithms have you explored so far? What are your criteria for the output image looking nice? $\endgroup$ May 16, 2020 at 3:51
  • $\begingroup$ @auspicious99 thanks I added in question. $\endgroup$ May 17, 2020 at 18:14
  • $\begingroup$ It is not possible to have an artifact-free method without reducing the space of images, nor providing details about the level of downsampling you when to use $\endgroup$ May 17, 2020 at 19:13

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To avoid checkerboard effect, you could consider a Gaussian smoothing filter.

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There is a nice discussion with image examples for the open source application Imagemagick: here and here.

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