Apply a spectral filter to the current image.

Filter—The names of filters that have been read are displayed in this list box. In addition, filters created with the LPF, BPF, and HPF functions are listed. Select the name of the filter that you wish to apply.

Load From File—Brings up a file selection dialog box. Use this dialog to choose a filter file to load.

Save To File—Save the selected filter in a selected file.

Multiply by Image—If this option is selected, the filter is multiplied by the current image. The current image is replaced by the result.

Multiply by FFT—Compute the FFT of the image and multiply the FFT of the image by the filter. Replace the current image by the inverse FFT of the result. For example, the following operation is performed:

image = FFT((FFT(image, -1) * filter), 1)

Create New Image—If this option is selected, the processed data is used to create a new image. Enter a suffix for the new image variable name in the text field provided.

Overwrite Image—If this option is selected, the current image is overwritten by the processed data.

Lower Cutoff—Enter a scalar floating-point value for the cutoff frequency of the filter.

Upper Cutoff—Enter a scalar floating-point value scalar float value for the upper cutoff frequency of the filter

DC Offset—Enter a scalar floating-point value for the DC offset of the filter. (Default: 0.0)

Maximum—Enter a scalar floating-point value for the maximum value of the filter. (Default: DC_Offset + 1.0)

Type—Select the data type of the output.

Center—If selected, shifts the output so that the center of the filter, the DC component, is the same as the center of the array.

Filter Order—Enter a scalar floating-point value for the filter order.

Variable Suffix—If the Create New Image option is selected, enter a suffix for the new image variable name. This suffix is added to the original variable name.

OK—Apply the filter and exit the dialog box.

Apply—Apply the filter, but do not exit the dialog box.

Cancel—Dismiss the dialog box without taking any action.

Help—Display online Help on the dialog box.