I use the following two methods to to generate text preview image for a .ttf font file
PIL method:
def make_preview(text, fontfile, imagefile, fontsize=30):
try:
font = ImageFont.truetype(fontfile, fontsize)
text_width, text_height = font.getsize(text)
img = Image.new('RGBA', (text_width, text_height))
draw = ImageDraw.Draw(img)
draw.text((0, 0), text, font=font, fill=(0, 0, 0))
return True
except:
return False
ImageMagick method:
def make_preview(text, fontfile, imagefile, fontsize=30):
p = subprocess.Popen(['convert', '-font', fontfile, '-background',
'transparent', '-gravity', 'center', '-pointsize', str(fontsize),
'-trim', '+repage', 'label:%s' % text, image_file])
return p==0
Both methods create correct preview images most of time but in some rare cases (<2%), the font.getsize(text) just cannot get the correct text size which result in text overflowed provided canvas. ImageMagick has same problem.
Sample fonts and previews:
HANFORD.TTF
http://download.appfile.com/HANFORD.png
NEWTOW.TTF
http://download.appfile.com/NEWTOW.png
MILF.TTF
http://download.appfile.com/MILF.png
SWANSE.TTF
http://download.appfile.com/SWANSE.png
I have looked into ImageMagick's documentations and found the explanation of this problem at http://www.imagemagick.org/Usage/text/#overflow.
Is it possible to detect such text overflows and draw text to fit the canvas as we expected?
See Question&Answers more detail:
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