1. For this, disable the segmentation overlay by selecting None for Overlay in the panel at the top of the 3D Image Processing dialog.
   
    
   In this way, the gray values can be seen without the red and white overlay previewing the current segmentation settings.
    
   In the body of the 3D Image Processing dialog, the gray scale image is visualized in 2D from three directions. Use the sliders under the corresponding image to scroll through the slices. Note that the blue, green and red lines visualize the position of slices selected in the other two views, respectively.
    
   
    
2. Check if the resolution is high enough for the usage of the image. Control if the gray values flicker when scrolling through the slices and make sure the sample is a representative cut-out. Also check if all phases contained in the structure can be differentiated by gray values. For this purpose, two visualization methods are available for gray scale images.
    
   Obviously, the round sample must be cropped to fit into a box without creating artefactual (erroneous) pore space in the corners. In the left panel in the Image Processing tab, expand Image Size by clicking the triangle and then expand the Crop panel. Enter 324 and 1724 for NX and for NY. For NZ enter 30 and 230.
    
   Observe the yellow square in all three 2D Visualization areas. It shows the resulting cutout. You can also determine the desired cutout by clicking and dragging the borders of this square with the left mouse key Click Apply to obtain the cropped image.
    
   

To generate a video slicing through the sample in 2D, switch now to the GeoDict GUI, where the gray value image is visualized as a volume field. Now, the empty domain around the gray value image must be cropped, too. To better visualize this, the gray value is first shown as 3D image and later the visualization is changed to 2D. The view can be changed using the 2D and 3D buttons in the toolbar.

If the gray value image is not visible, in the View Controls panel switch to the Volume Field tab and move the threshold slider all the way to the left.

Select Model - ProcessGeo from the menu bar. In the ProcessGeo section, on the bottom left, select Crop, Embed & Add Layers from the first pull-down menu and Crop from the second. Click Edit.

1. For NX and NY enter 1400 for the right clipping value and for NZ enter 200. Click OK in the dialog and Crop in the ProcessGeo section.
    
   
    
2. After changing back to the 2D view as described above, from the Camera tab, in the View Controls above the Visualization area, select Z from the Direction pull-down menu.
    
   
    
3. From the menu bar, select File - Save Video as... and in the opening Create Video dialog click Generate Video for the Back to Front (all slices) video preset.
    
   
    
4. Choose a meaningful Result File Name, for example QualityControl-2D.gdr and click Run.
    
   
    
   The video, slicing evenly through the structure, is generated in about 3 minutes depending on the machine, and saved to your project folder. The corresponding GeoDict result file is opened in the Result Viewer. The report shows data about the video.
   
    
5. Move to the Data Visualization tab and click Play to watch the video in your default video player.
    
   
    
   Below you can watch the resulting video. Slicing evenly through the image can reveal image artifacts. Observe if the image flickers or if there are alignment issues. For FIB-SEM images this can also be helpful to find out, what is background and what is foreground. Click Close to close the Result Viewer.

There is no flickering in the image and the slices are aligned well. The resolution of the individual particles is good, but the carbon black and binder phase cannot be differentiated from the active material by gray value. Thus, a neural network is needed to distinguish between the two phases, as described in the second part of this tutorial series.

To again visualize the sample in 3D, select View - 3D Rendering from the menu bar or click on the 3D icon as described here. The gray scale image is then displayed in 3D. Use the mouse cursor to turn the structure and watch it from all sides.