PixmapUtils.java

    //Overlays using pixel from base images and making a percent darker
    public static Pixmap combineImages(final Pixmap basePixmap, final Pixmap overlayPixmap) {
        final Pixmap newPixmap = new Pixmap(basePixmap.getWidth(), basePixmap.getHeight(), basePixmap.getFormat());

        final int adjustedWidthIndex = basePixmap.getWidth();
        final int adjustedHeightIndex = basePixmap.getHeight();

        for (int row = 0; row < adjustedHeightIndex; row++) {
            for (int column = 0; column < adjustedWidthIndex; column++) {
                final int basePixel = basePixmap.getPixel(column, row);
                final int overlayPixel = overlayPixmap.getPixel(column, row);

                if (isTranslucent(overlayPixel)) {
                    newPixmap.drawPixel(column, row, 0); /* Set translucent if is translucent color*/
                } else if (overlayPixel == 0) {
                    newPixmap.drawPixel(column, row, basePixel);
                } else {
                    newPixmap.drawPixel(column, row, overlayPixel);
                }
            }
        }
        return newPixmap;
    }