Point Image Filter Tool - Settings Tab
Operation
Defines the image enhancement technique that will be applied to the region.The result of the image enhancement technique will automatically update within the region.
| Operation | Description |
|---|---|
| Binarize (default) | Filters the image based on a greyscale threshold into white (255) or black (0); outputs an image where input pixel values equal to or above the threshold value are white, and values below the threshold are black. |
| Clip | Filters the image by comparing the greyscale value of each individual pixel to a minimum and maximum greyscale value; outputs an image where the extreme ends of the greyscale spectrum are eliminated so features are more uniform. |
| Equalize | Filters based on a histogram equalization, where the most frequent greyscale values are equalized to create a more even distribution; outputs an image with increased contrast. |
| Greyscale Distance | Filters based on the greyscale value of each output pixel as the difference between the greyscale value of each input pixel and the threshold level; outputs an image where, for example, if the input pixel value is 100 and the threshold is 25, the output pixel value is 75. |
| Invert | Filters based on a greyscale inversion of pixel values; outputs an image that is a "negative" of the input image. |
| Threshold Range | Filters based on a binary (black and white) threshold which compares each input pixel with two threshold values (minimum and maximum) to determine whether the output pixel is white or black; outputs an image where if the input pixel value is equal to or exceeds the minimum or maximum, the output pixel is white, and if the input pixel value is within the minimum or maximum, the output pixel is black. |
| Optical Density | Filters based on an inversion of pixel values on a logarithmic scale; outputs an image that reveals the density of objects and features by measuring the amount of light passing through them. Denser objects and features are represented by lighter pixels in the output image. |
| Stretch | Filters by linearly scaling or "stretching" the greyscale values; outputs an image with increased contrast. |
Minimum
Defines the minimum greyscale value (0 to 255) for the Clip and Threshold Range operations. This control is only enabled when one of the two Operations is selected.
Maximum
Defines the maximum greyscale value (0 to 255) for the Clip and Threshold Range operations. This control is only enabled when one of the two Operations is selected.
Threshold Mode
Defines the mode for determining the grayscale value that segments the region of the image into black and white pixels when the Operation is set to Binarize, Greyscale Distance or Threshold Range.When Auto is selected (default = Auto), the tool will create a default Smart Setting based on your image, each time an image is acquired, constantly adjusting for changes in brightness from image to image. When Manual is selected, you manually enter and adjust the value.
Threshold
Defines the grayscale value that separates black pixels from white pixels (0 - 255, when enabled) for the Binarize, Greyscale Distance and Threshold Range Operations; pixel values below the threshold are classified as black and pixel values above are classified as white. This control is Off by default, and requires that the Threshold Mode be set to Manual to be enabled. Use the Graph to set an optimal value for your application.