# 4.2 Interactive Experimenting Finding a pair of suitable min/max thresholds for initial segmention and placing grain and background markers at the appropriate pixles are sometimes challenging. Trial and error is a commonly conducted practice. iPeriGrain offers efficient tools to such task. Users can experiment with their input and conduct segmentation in an interactive manner. ## "Redo" and "Undo" tools ![](https://i.imgur.com/0DNleBp.png) ## "Save intermediate results" tool ### To save intermediate results -- Select a "Result Index" -- Click "Save" to save the intermediate result ### To restore intermediate results -- Select a "Result Index" with intermediate result -- Click "Restore" to restore the result ![](https://i.imgur.com/evgLk24.png)