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Apply the matcha filter.
The same colour model the removal tool inverts, run forwards. Drop a photo or clip in, set how far you want it pushed, and save.
What the look is made of
Four things happen at once. Red and green are lifted together while blue is cut to a little over half, which is what makes the result chartreuse rather than simply green. Contrast compresses toward the midtones. The black floor lifts, so nothing in the frame is truly dark any more. A little grain goes on top.
All four are per-pixel colour operations, which is why the plain version can be inverted later. The posterised option is different in kind: it collapses the image onto a single luminance ramp and steps it, discarding colour rather than shifting it.
Questions
Is this the same effect TikTok uses?
It is built from measurements of real before-and-after pairs, so the colour behaviour matches closely: red and green ride together while blue is cut to roughly half, contrast compresses, and the black floor lifts. It is not a byte-for-byte copy of any one app's effect, and the posterised option is a separate, heavier look.
Why does the strong version look blocky?
Because the heavy matcha-art look genuinely is. It maps every colour onto a single green ramp and quantises the result, which is what gives it the painted, stepped surface. Turn off the posterised option for the plain colour grade.
Can I undo it later?
The plain grade, yes: keep the strength moderate and the removal tool inverts it well. The posterised version, no. It discards colour information rather than shifting it, and nothing brings that back.