The tone map plots four dimensions across the script's runtime: tension, warmth, dread and comedy.
It is derived from what you have written, and it is reshapeable — drag the dread curve up in Act 2 and the affected scenes are identified for rewriting.
Each scene mirrors its tone targets, which then inform shot suggestions, colour grading and music cues downstream. A scene marked high-dread gets different coverage grammar than one marked warm.