text_decoration (underline, line_through) is too thin than the font default from the other render result

[Kenneth]

Hello there

When I use ImageMagick with decorate option

The result seems wrong when I compare Photoshop or MS Word result

The problem is that the line width of underline or throughline is too thin than which I expected

Even ImageMagick uses depending on the OTF font information

The line is extremely thin and there seems an issue of line position (y and x as well)

Check the below result for your understanding



Font name -> Noto Sans CJK JP Medium (OTF version)



Photoshop result




MS Word result




ImageMagick result(7.0.8-50 Q16 x86_64)




Below is a command snippet

Code: Select all

convert \
    -size 320x120 xc:white -draw \
    "fill black font-size 64 font '/Users/user/Downloads/NotoSansCJKjp-hinted/test.otf' decorate LineThrough gravity center text 0,0 'test'" linethrough.gif

[Kenneth]

Hmmm, There seems no one is interested in this issue...

So I tried to fix this issue by my self by changing the source file in MagickCore

And below is the result (this case I used NotoSerifCJK JP)

Underline


LineThrough



There seem two issues in the code

1. skip some condition when PolygonPrimitive uses stroke width
2. A calculation logic for underline_thickness which FreeType gave includes an issue

I will make PR for solving this issue very soon

[Kenneth]

There seems still an issue in annotating process (line through position is not correct accurately)

I will fix that issue as well, and then you can check the source code from PR in GitHub

[magick]

We were about to investigate this issue but you saved us the time. Looking forward to your PR.

[Kenneth]

I just sent a PR at https://github.com/ImageMagick/ImageMagick/pull/1619