LÖVE

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uniform vec2 imageSize;

bool isMagenta(vec4 pixel) {
  float errorMargin = 0.05;
  if (
    (pixel.r >= (1 - errorMargin) && pixel.r <= 1) &&
    (pixel.g >= 0 && pixel.g <= errorMargin) &&
    (pixel.b >= (1 - errorMargin) && pixel.b <= 1)
  ) {
    return true;
  } else {
    return false;
  }
}

vec4 effect(vec4 loveColor, Image tex, vec2 uv, vec2 screenPos) {
  vec2 uvPx = uv * imageSize; // I don't really know what this or the other next 2 lines do
  vec2 f = fract(uvPx); //
  vec4 pixel = Texel(tex, uv);
  vec4 transparent = vec4(0, 0, 0, 0);

  if (isMagenta(pixel)) {
    return transparent;
  } else {
    return pixel;
  }
}