The Sonar Effect

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This effect changes the original into a sonar image (or maybe a blurry ecograph). As usual it is best to let the Wizard choose initially, and subsequently using the F8 key to make variations on the effect.

 

You can change the area of the image which is accessible to the Sonar, other areas will be a uniform color. You can also add noise to the image (to make it look more grainy) by setting the noise to more than 0, 0.2 or 0.3 are good values.