system configurations. freetype/lcd_filter 0, 1, 2, 16 1 Parameter that affects subpixel rendering (reference: http://freetype.sourceforge.net/freetype2/docs/reference/ft2-lcd_filtering.html#FT_LcdFilter ). gamma/xxx Non-negative decimal 1.0 Correct colors by the given gamma value. For gray-level rendering mode ( subpixel_render is 0), only the value in the <gray> node is used, and all gray levels are corrected. For