Main Features:
* userfriendly and GUI based PIV tool
* multi-pass, multi-grid window deformation technique
* import bmp/ tiff/ jpeg image pairs/ series
* multiple image sequencing styles
* individual image masking and region of interest
* image pre-processing
* two different sub-pixel estimators
* multiple vector validation methods
* magnitude/ vorticity/ divergence/ shear / ...
* data smoothing, vector field highpass
* multiple colormaps
* streamlines
* extensive data extraction tools
* statistics
* synthetic PIV image generator
* Many data export features
* main features accessible via comand line scripting




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  2. I've tried to extract the velocity magnitude the same way but then I get this error:

    Undefined function or variable 'varis'.

    Error in PIVlab_GUI>draw_area_Callback (line 5266)
    fprintf(fid, ['Frame Nr.,' par ': ' whatoperation ' ' varis '\r\n']);

    Error in gui_mainfcn (line 95)

    Error in PIVlab_GUI (line 52)
    gui_mainfcn(gui_State, varargin{:});

    Error in>@(hObject,eventdata)PIVlab_GUI('draw_area_Callback',hObject,eventdata,guidata(hObject))
    Error while evaluating UIControl Callback.

    I haven't touched anything in the original code. Any thoughts?