@sprite-color-matrix applies a color grade to one sprite and holds it there, shifting brightness, contrast, saturation, and hue in any combination you choose. Unlike a momentary flash, the grade persists after its transition completes - a character can stay drained of color or steeped in a sickly tint for as long as the scene demands.

Reach for it whenever one character needs to look visually distinct from the rest of the cast. A flashback subject stripped of color, a feverish ally tinted sallow, a ghost rendered pale and overexposed - each is a single call. Because all four axes are available together, you can land a complex look without chaining separate effects.

The duration controls how long the grade fades in, not how long it stays. Once the transition finishes the grade simply holds. To lift it, call @sprite-color-matrix on the same target again with every channel returned to its neutral value and let it fade back out at whatever pace fits the moment.

If a scene-wide color effect is already running, the two grades compound. A warm scene tint plus a per-sprite warm tint can produce a heavier result than either alone, so test the combination before locking the scene.

Setting wait to false lets you fire grade transitions on several sprites back to back so they run in parallel rather than in sequence - useful for a group flashback where every character drains to grey at the same time.