Working with the preprocessing pane
| Tip: | The preprocessing pane is not shown in the default layout. Use the Window menu to show it. |
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The preprocessing pane is rarely used, and exists only to allow fine tuning of the underlying algorithm used to detect colours. This is a stochastic algorithm, meaning that it may produce slightly different results each time, although generally this will not be noticeable to the naked eye. You may occasionally, however, see slightly different colours selected, even for the same photo and same settings.
Care should be taken when adjusting the first two of these settings in particular, as large values may make the program unresponsive.
- Reps sets the number of times the algorithm is run. The best result from all runs is then used. Increasing this may improve both the quality and consistency of colour detection. It will increase runtime when clusters are added or removed, but not at other times.
- Pixels sets the number of pixels used for colour detection. Approximately this many pixels are subsampled from the image. Increasing this may improve the quality and consistency of colour detection, particularly when attempting to select small regions of colour. It will increase runtime when clusters are added or removed, but not at other times.
- Threshold sets the minimum saturation value of a pixel for it to be considered in colour detection. Adjusting this may improve the quality of colour detection in some situations, particularly where the detection of very bold colours in the image is sought, and less saturated pixels appear to be detracting from the final result.
