Text with stroke Anti-aliasing (shadow) problem

[badabou]

Hi,

I have a problem when a text is generated with an stroke.

The command :

Code: Select all

convert -background "#ff0000" -fill white -strokewidth 3 -stroke "#00ff00" -size 500x100 caption:"A small test" text.png

We can see that the result is not clear :



Here is the same image with a zoom :



We see that the edges of text are not clean.

Looks like there was like a black shadow.

I used the last Imagemagick version.

[snibgo]

That is anti-aliasing. If you don't want it, turn it off:

Code: Select all

convert -background "#ff0000" -fill white -strokewidth 3 -stroke "#00ff00" -size 500x100 +antialias caption:"A small test" text.png

[badabou]

There is a bug in Imagemagick for sure.

Here is an example with two different versions of Imagemagick with a transparent background:

Code: Select all

convert -background transparent -fill "#00ff00" -size 500x100 caption:"A small test" text.png

- The old version 6-5-9-2 (the result is good) :

- With the new version 6-9-0-5 (the result is not clean) :

We see that there is a problem with the text edges.

[snibgo]

I can't reproduce that problem, but I'm using 6.9.0-0. Someone else might test with a newer version.

[badabou]

I just tested with version 6.9.0-0 dans there no problem.

Ultimately, it is the 6.9.0-5 version where there is a problem.

[fmw42]

I have tested and it seems fixed in IM 6.9.0.7beta (Mac OSX SnowLeopard)

[badabou]

Same problem with ImageMagick 6.9.0-6.

[badabou]

Indeed, ImageMagick-6.9.0-7 beta (linux) there is no problem.

[doctor_regtools]

I am getting this problem on imagemagick 6.9.7-4 (on Ubuntu)

Same test case as before

running

Code: Select all

convert -background "#ff0000" -fill white -strokewidth 3 -stroke "#00ff00" -size 500x100 caption:"A small test" text.png

gives me



As you can see the 'S' and the 'a' are lower than the other letters.

[fmw42]

I do not see this issue in IM 6.9.10.0 Q16 Mac OSX. I suggest you upgrade. 6.9.7.4 is over 200 versions old.

[doctor_regtools]

OK I installed from source - so I am now running 7.0.8-1

Same issue though. Wonder if it's OS related rather than version related?

[fmw42]

Which issue do you question? There are two above. I tried 7.0.8.0 on my Mac and the last one above about uneven baseline and it seems fixed. IM 7.0.8.1 is beta and could be undergoing some changes. So I would not trust that, yet.