You can filter ICC profiles with a low-pass filter in Prinect Color Toolbox. This function is optional and you can display it in all the main functions using the "Tools" menu. The filter creates smoother transitions in the color space and is applicable mainly for press profiles.
'Correct profile by smoothing' Dialog
You can call up this dialog with the "Tools > Profile smoothing" menu.
Convert profile with filter properties
This is where you set a low-pass filter to make the color space even smoother and thus enhance the profile quality.
Input profile name
Click "Open..." (beside Input profile name) to open the profile browser where you can select and open an input profile.
Output profile name
The name of the input profile appended by "_Filtered" automatically displays in the text box.
You can overwrite this name or click "Open" (beside Output profile name) to open the profile browser where you can select the output profile.
Rendering Intent
Profile conversion occurs with the "Perceptual" rendering intent. Enabling this option also lets you enable the additional calculation with the "Rel(ative) colorimetric" and "Abs(olute) colorimetric" rendering intents (see Rendering Intent for a description).
Profile smoothing
You can set a value between "0" (no smoothing) and "10" (maximum smoothing) using the slider.