Butter2D: Butterworth Filter Demo

About Butterworth Filters

The Butterworth filter is designed to have a frequency response as flat as possible in the passband. It is often used in image processing to attenuate specific frequency components.

Cutoff Frequency Ratio: Determines where the filter starts attenuating frequencies. Value between 0.0 and 0.5.

Filter Order: Controls the steepness of the filter's transition. Higher orders result in sharper transitions.

High Pass: When checked, attenuates low frequencies (e.g., blurs). When unchecked, attenuates high frequencies (e.g., details and noise).

Squared Butterworth: When checked, the filter response is squared, resulting in a sharper transition.

Color Mode: When checked, processes each RGB channel separately, preserving color information. When unchecked, converts to grayscale first.