Freetype render fonts differently than in Ubuntu

I want to put truetype font into the pucture in Alpine linux and this picture save or get bits values (load()).
This module I using in my user interface graphic display.
So i have been using python with pillow module which converts truetype fonts to bitmap (thanks freetype lib)

Actually in Ubuntu everything works fine:
Ubuntu example: http://i.imgur.com/e9TuHJl.jpg

but in Alpine text is rendering different (bad):
Alpine example: http://i.imgur.com/uKfA1wX.jpg

Version of Python is 3.5 (Ubuntu and Alpine are same)
Version of Pillow is 4.0.0 (Ubuntu and Alpine are same)

Freetype version
Ubuntu: libfreetype6-dev_2.6.1-0.1ubuntu2.1_amd64.deb
Alpine: freetype-2.7-r0

I use this simple script:

from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
 
image = Image.new('1', (192, 64))
draw = ImageDraw.Draw(image)
 
font = ImageFont.truetype('fnt/arial.ttf', 10)
draw.text((0,0), 'Hello world!', font=font, fill = 1)
 
font = ImageFont.truetype('fnt/arial.ttf', 15)
draw.text((0,15), 'Hello world!', font=font, fill = 1)
 
font = ImageFont.truetype('fnt/arial.ttf', 20)
draw.text((0,40), 'Hello world!', font=font, fill = 1)
 
image.save('test', 'JPEG')

Has anyone know why its render differently? I am 100% that font is loading from my directory (font file is same in Ubuntu & Alpine)
Thanks Mike