How to apply custom color gradation bar within the width of the sheet (trim box) in Plato?
Before applying SmartMarks, you need to enable the check box Clip or Repeat the Image horizontally/ vertically under the Image tab. After enabling horizontally/vertically, the color bar will be clipped on the sheet (trim box). If the color bar is smaller than the width of the sheet, it repeats until it fills the complete width of the sheet.
See also the following KB article to prevent color bar containing partial patches:
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Plato all versions
SmartMarks in Automation Engine (S&R and Add SmartMarks task)