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To find the optimal σ for each image to create the Gaussian & impulse filter with, a good starting point through experiementation is 2% times the shorter of the width and height of the LPF image, and 1% for the HPF image. In the example above, the optimal percentages were found to be 3% and 1% for the low and high frequency image:
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To find the optimal σ for each image to create the Gaussian & impulse filter with, a good starting point through experimentation is 1.8-3% times the shorter of the width and height of the LPF image, and 0.6-1.5% for the HPF image. In the example above, a cutoff percentage of 3% and 1% was used:
This effect can also be used on any 2 images that are aligned, like the following examples:
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This effect can also be used on any 2 images that are aligned, like the following examples, which use a frequency cutoff of 2% and 0.8% times the shorter side:
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