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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static ImageSurface showImageWithGrayToBlackSlider(S name, final BufferedImage img) {
  final ImageSurface is = showImage(name, img);
  final SimpleLiveValue<Float> lv = floatLiveValue();
  
  Runnable update = r {
    BufferedImage img2 = cloneBufferedImage(img);
    float darkening = min(lv!, 0.99f);
    float factor = 1/(1-darkening);
    int offset = iround(-darkening*255);
    rgbContrastAndBrightness(factor, offset, img2);
    is.setImage(img2);
  };
  
  lv.onChange(update);
  addToWindowAndPack(is,
    withLabel("Darkening factor:", jLiveValueSliderZeroToOne(lv)));
  ret is;
}