Bitmap fonts choppy

[io12]

Commands of the form:

Code: Select all

convert -font "BitmapFont" +antialias label:text ...

produce a choppy image.

Image of the problem:


Code used to produce the image:

Code: Select all

convert -background white \
	-fill black \
	-font "Terminus-(TTF)" \
	-pointsize 12 \
	+antialias \
	"label:ImageMagick" \
	out.png

[fmw42]

+antialiasing disables anti-aliasing. Try removing +antialiasing. See http://www.imagemagick.org/script/comma ... #antialias

[io12]

That just makes the text look blurry. Bitmap fonts shouldn't need to be antialiased.

[snibgo]

You have specified a very small size for that font, so small that some verticals are less than half a pixel thick. So if you anti-alias them the verticals are gray but visible. If you don't anti-alias, they are zero thickness.

Remedy: choose a different font or larger size.

[io12]

The font still doesn't look right at a larger size , but I shouldn't need to set a large size anyway. Terminus-(TTF) looks fine in gimp at 12pt. I think that this is a bug in ImageMagick. On the project page for Terminus TTF (https://files.ax86.net/terminus-ttf/), it says:

There are applications that neither support the original Terminus Font nor use bitmaps embedded in TrueType fonts. They completely rely on the automatically generated scalable outlines.

Another bitmap font I tried had the same problem. Maybe ImageMagick lacks support for bitmaps inside TTF fonts?

[fmw42]

Did you remove +antialiasing as I suggested above?

[snibgo]

IM doesn't directly handle fonts, but uses the freetype library.

[magick]

Thanks for the problem report. We can reproduce it and will have a patch to fix it in GIT master branch @ https://github.com/ImageMagick/ImageMagick later today. The patch will be available in the beta releases of ImageMagick @ http://www.imagemagick.org/download/beta/ by sometime tomorrow.

[io12]

Not sure if it was resolved from a fontconfig update or an ImageMagick update, but it works perfectly now. Thanks!