For Arabic typography, you might want to use Inkscape 0.9 as follows (Window7 cmd):
inkscape "ar.svg" --export-png="C:\Users\Path\TO\output\arabicthabit.png" --export-dpi="900,900" --export-background="rgb(100%,100%,100%)"
Where ar.svg is:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns="http://www.w3.org/2000/svg"
width="400"
height="100"
version="1.1">
<text
xml:space="preserve"
style="font-size:30px;font-style:normal;fill:#000000;fill-opacity:1;stroke:none;font-family:'Droid Arabic Naskh';font-weight:bold;"
x="10" y="90"
><tspan>لغةٌ عربيّةٌ</tspan>
</text>
</svg>
You can replace the font-family:'Droid Arabic Naskh'
by any font in your system.
Also you can change the output format as stated in the man pages of Inkscape. Moreover, you can start in Inkscape GUI and save the SVG and change what you want in the SVG XML in any scripting language.
Inkscape 0.48 returned buggy Arabic typography.
As for ImageMagick 6.8.9-7, I used Python +Wand(Python Lib)+arabic_reshaper(Python Lib)+bidi.algorithme(Python Lib) to generate correct Arabic typography in images:
from wand.image import Image as wImage
from wand.display import display as wdiplay
from wand.drawing import Drawing
from wand.color import Color
import arabic_reshaper
from bidi.algorithm import get_display
reshaped_text = arabic_reshaper.reshape(u'لغةٌ عربيّة')
artext = get_display(reshaped_text)
fonts = ['C:\\Users\\PATH\\TO\\FONT\\Thabit-0.02\\DroidNaskh-Bold.ttf',
'C:\\Users\\PATH\\TO\\FONT\\Thabit-0.02\\Thabit.ttf',
'C:\\Users\\PATH\\TO\\FONT\\Thabit-0.02\\Thabit-Bold-Oblique.ttf',
'C:\\Users\\PATH\\TO\\FONT\\Thabit-0.02\\Thabit-Bold.ttf',
'C:\\Users\\PATH\\TO\\FONT\\Thabit-0.02\\Thabit-Oblique.ttf',
'C:\\Users\\PATH\\TO\\FONT\\Thabit-0.02\\majalla.ttf',
'C:\\Users\\PATH\\TO\\FONT\\Thabit-0.02\\majallab.ttf',
]
draw = Drawing()
img = wImage(width=1200,height=(len(fonts)+2)*60,background=Color('#ffffff'))
#draw.fill_color(Color('#000000'))
draw.text_alignment = 'right';
draw.text_antialias = True
draw.text_encoding = 'utf-8'
#draw.text_interline_spacing = 1
#draw.text_interword_spacing = 15.0
draw.text_kerning = 0.0
for i in range(len(fonts)):
font = fonts[i]
draw.font = font
draw.font_size = 40
draw.text(img.width / 2, 40+(i*60),artext)
print draw.get_font_metrics(img,artext)
draw(img)
draw.text(img.width / 2, 40+((i+1)*60),u'ناصر test')
draw(img)
img.save(filename='C:\\PATH\\OUTPUT\\arabictest.png'.format(r))
wdiplay(img)