below code doesn't make same result.
---
PImage a;

void setup() {
size(200, 200);
a = loadImage("foo.jpg");
image(a, 0, 0);
tint(127);
image(a, 50, 0);
if (false) { // <<<
tint(255);
} else {
noTint();
}
image(a, 100, 0);
tint(127);
image(a, 150, 0);
}
---
true root makes bright-dark-bright-dark picture.
false root makes bright-dark-bright-"bright" picture.


PGraphics2.imageImpl() {
if ((tint && !cash.tinted) ||
...
(!tint && cash.tinted)) {
...
}
}

above condition seems to be something wrong.
nobody turn cache.tinted off except constructor.

k thanks, will look into it.

fixed for release 0132, thanks for the report.