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I'm trying to generate some text in an image that will be embedded in an email. I would like to look as much as possible as the other text in the message body; so I tried:

i = Image.new(500, 100)
d = Draw.new
d = d.annotate(i, 0,0,0,25,nombre){
 self.font = "Arial-Regular"
 self.pointsize = 12
 self.text_antialias = true
}

but the output is awful (see output here)

I'm using Ubuntu, I've installed msttcorefonts (Arial appears on convert -list font). I've also tried using other fonts/font_families and turning off text_antialias with the same luck

Any hints?

runixo
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2 Answers2

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The problem is almost certainly not the DPI, it's that ImageMagick is doing both stroke and fill for fonts. Try d.stroke('transparent') on your graphics context, and then you should just see the fill, which is the actual region the font was trying to draw, rather than its outline.

Seebs
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Make the image bigger and increase your DPI. Or, make the image bigger and use a larger pointsize. To my eye, it looks as though your text is aliased simply because it is so small.

jsp
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  • Imagemagick uses dpi=72. I think Chrome uses dpi=96. Therefore, if Chrome has a larger dpi, the characters will render with more pixels. Look closely at your example. The chrome characters are indeed just a bit taller. Moreover, the hinting looks different on the two examples. Remember, Linux has two font configuration systems. X uses one, gnome uses another. It's a mess. [look here](http://neugierig.org/software/chromium/fonts/) – jsp Jul 23 '13 at 20:42
  • Interesting, thanks. I found that if I set a `background_color` (any!) fonts look better. see: [Without background_color](http://i.imgur.com/dd5c4cY.png) / [With background_color](http://i.imgur.com/bQDsgrw.png) I'm going to report a bug to rmagick, something looks bad here.. Thanks for the link! – runixo Jul 24 '13 at 10:02
  • I noticed the same issue on my system. Was your bug report ever handled? – Jeef Apr 11 '14 at 12:14