The Filter Dialog

To perform a filtering process Right click on either a 2d Image window or a curve window. In the pull-down menu, press "filters" and the filter menu appears with a possible list of filters available as shown below. Note, the availability of the filter module depends on your license.

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By use of this filter dialog different filters can be created, loaded, shown and altered.

The filter dialog has three tab dialogs where Convolution, Median or Statistical Difference filters can be chosen. When the convolution filters tab is selected four groups of convolution filters can be selected: Smooth, Sharpen, Edge and Gaussian ISO 11562. At all times the title bar contains the name of the filter source.

 

To apply a selected filter, just press Apply. Alternatively set the "Auto Apply" checkbox on and every change of filter parameters will be applied immediately to the source image.

The auto apply button is most practical for checking the effect of smaller kernels where the filter effect can be monitored in almost real-time while modifying the filter parameters. Larger kernels require more computation time and it may therefore be more convenient to disable the Auto Apply option.

 

 

images\filtermenuselection.gif

 

The different predefined filters can be loaded from the "Filter Dialog" as shown above. The "File" button is used to load pre-defined filters from the hard disk.

The filter module is delivered with a number of predefined filters and the user has tools for designing and storing user-defined filters. By directly choosing any of the available filters the filtering takes place and the result will be shown as indicated in the output options.

 

These predefined kernels can also be loaded from the "Filter Dialog" using the "Load" command. The filters can be found in a map called "kernels" in your SPIP program directory.

Allows opening a kernel file from a diskette, CD or hard disk. Normal file extension for the added filters are: ".flt". Other files can be searched for by changing the type of files to (*.*) all files. The software is capable of reading filter kernels from ASCII files, where the parameters are organized on one line per row of data.

When saving a filter kernel file in a sub directory of the kernel directory, the file will appear in the Filter Dialog automatically next time the "File" button is pressed. It is also possible to create a limited number of maps. The default extension for the filters files is .flt. The kernel filters are in ASCII format and can be viewed and edited in notepad.