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# What are the different filters?

- Equalize: This filter redistributes the brightness values of the pixels in the image. As a result, the range of brightness levels are more evenly represented. Use this filter if you have too dark or too bright images.

- Stretch: This filter linearly scales up or stretches the greyscale values in the input image to the full 256-step greyscale. The result is an ouput image with increased contrast.

- Low Pass: Using this filter results in output images where edges are smoothed or blurred.

- Dilate: This filter increases bright features and shrinks dark features. The result is an output image with larger areas of bright pixels. Use this filter to remove dark specks.

- Erode: This filter shrinks bright features and increases dark features. The result is an output image with larger areas of dark pixels. Use this filter to remove light specks.

- Open: This filter performs an erosion followed by a dilation to filter out bright features that are smaller than the size of the processing neighborhood. The result is an output image with slightly decreased overall brightness.

- Close: This filter performs a dilation followed by an erosion to filter out dark features that are smaller than the size of the processing neighborhood. The result is an output image with slightly increased overall brightness.

- Auto Stretch: This filter reduces the pixel value range. It maps the pixel values from 0 to 255.

- Optical Density: This filter specifies an inversion of pixel values based on a logarithmic scale. The result is an output image that reveals the density of objects and features in the input image by measuring the amount of light that passes through them. Denser objects and features are represented by lighter pixels in the output image.

- Invert: This filter specifies an inversion of pixel values based on the 256-step greyscale. The result is an output image that is a "negative" of the input image.

- Median: This filter is applied to all the pixels of the image. For each pixel, the filter observes the brightness of surrounding pixels, and sets the pixel to their median. This results in a smoother image with fewer and weaker extremes.

- Gamma Correction: This filter performs brightness adjustment based on the gamma correction value provided as a sub-setting.

- Scale: This filter allows the percentile scaling of the image along the X and Y axes (either, or both).

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