Heat map for «Out of gamut» visualization
This feature compares the currently opened PDF page based on its actual or assigned source color space/output intent profile against a color converted version of that page in an out of gamut heat map view.
Understand the UI:
- The feature offers views that can be toggled between different specialised views like the original color space image, target color space image, overlay with heat map and regular page view.
- For each pixel, the color distance (in delta E) is computed and the result is represented as a pixel image where each pixel represents that distance by using a certain color (the ‘heat map image’); the colors range from yellow over red to pink
- Threshold distance: Pixels below a threshold distance of e.g. 2.5 delta E shall be transparent
- The current “color state” is the ‘current document color space’
- The “color state” that results from color converting the PDF page is the ‘target color space’
- Delta E methods: Delta E 2000 OR Delta E 1976
- Toggle between current and target view manually by clicking the switch view button
- Turn heat map view on and off manually by clicking the show/hide heat map button
- Continuously toggle between the two views
- To find out what the color difference is in a given position, delta E value and matching color patch are shown for current mouse position
- If delta E at mouse position is below threshold, the color patch is shown using black
- If mouse position is outside of page area, delta E is shown as “–“, and the color patch is shown using black
- The heat map image is placed on top of the current page view