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sci / sci.image.processing / downsampling by a fraction

SubjectAuthor
o downsampling by a fractionMike Sousa

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Subject: downsampling by a fraction
From: Mike Sousa
Newsgroups: sci.image.processing
Date: Fri, 14 Jul 2023 16:05 UTC
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Subject: downsampling by a fraction
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Hi

I need to downsample an image (bitmap image of a Spectrogram) by a fraction, N/D, (rational: ex 4/5). I understand that this can be done with resampling by 4 followed by decimation by 5. If this is true, is there a more efficient way in this case, more efficient == computationally faster)?
Thanks...

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