Devanagari font not rendered correctly

[shubhampateliitm]

What did you do?

I am trying to print Devanagari text on the image. The text is printing on the image. But, it is not appearing the way it supposed to be. Devanagari is not like ordinary language script. In UTF-8 standard some particular characters when appear together show different character(The new character that formed is not define in UTF-8). Take a look at this doc for reference look this doc : https://www.unicode.org/versions/Unicode6.0.0/ch09.pdf#G12284 and variant shape section of this https://www.unicode.org/standard/where/.

Python Code :

from PIL import Image, ImageDraw, ImageFont

img = Image.new('RGB', (100, 30), color = (73, 109, 137))

fnt = ImageFont.truetype('NotoSans-Regular.ttf', 15)
d = ImageDraw.Draw(img)
d.text((10,10), "यात्रा", font=fnt, fill=(255, 255, 0))
img.save('pil_text_font.png')

Eventually Ubuntu also suffer from the same problem.

Please try to rectify this issue. Since otherwise it will changing whole spelling of words which is not fair to any Devanagari reader(Devanagari is the script for languages such Hindi, Marathi, Nepali).

Yatra shouldn't be like.

It should be like

[radarhere]

Just a link to NotoSans-Regular - https://fonts.google.com/specimen/Noto+Sans

[shubhampateliitm]

@radarhere I don't get it. What do you mean by link of NotoSans Regular ??

[radarhere]

Apologies, I wasn't trying to give you advice, I was trying to assist any future people looking at this issue by providing a link to the font that you were using, in order to help them to replicate your issue.

To try and be helpful now though, is raqm a possible solution to your problem? https://pillow.readthedocs.io/en/5.2.x/releasenotes/4.2.0.html#added-complex-text-rendering
https://pillow.readthedocs.io/en/5.2.x/reference/ImageFont.html?highlight=raqm#PIL.ImageFont.truetype

[shubhampateliitm]

@radarhere This guy @ldo has some implementation of harfbuzz along with Cairo and Freetype, which worked for me. https://github.com/ldo/harfpy .
Maybe it can be helpful in resolving this issue.

[ldo]

Just to clarify, the issue is that the writing system in question has mandatory contextual substitutions, so a simple character-to-glyph mapping is insufficient for correct text rendering. The way to deal with this is to support OpenType text shaping, which is what HarfBuzz does for you.

This may be sufficient for the Indic scripts, which I believe are all left-to-right. Then you may want to support bidirectional scripts as well (Hebrew, Arabic). This will require FriBidi. Then there are other complications, like Thai...

[HinTak]

Give this a try - it has a devanagari example, https://github.com/HinTak/harfbuzz-python-demos .

[bipul21]

Hi,

I am not sure if this is related.
I am trying some devanagari font text (hindi) with python 2.7.15, Pillow 3.5.0 and ubuntu 16 with harbuff, freebid and raqm setup.
The problem i am facing is that with "NotoSans-Bold" font type output is clipped but with Lohit Devnagari (https://www.fontsc.com/font/lohit-devanagari) it returns a correct output.

A sample script

# coding=utf-8
from PIL import Image, ImageDraw, ImageFont

string = u'से नये'
font = ImageFont.truetype('/<absolute_path>/NotoSans-Bold.ttf', 48)
im = Image.new("RGB", (200, 200), (255,0,0,0))
d = ImageDraw.Draw(im)
d.multiline_text((0, 0), string, fill="#000000", font=font)
im.save("hindi.jpeg")

With NotoSans-Bold (Incorrect)

With Lohit-Devanagari (Correct)

I would like to use "NotoSans-Bold" 💯

[ldo]

@bipul21 When I try your example text with Noto Sans Bold on my system, it just shows up as empty blocks, while Lohit Devanagari renders fine.

Is there some kind of substitution going on with another font? And the clipping could be happening because the wrong font metrics are being used?

[bipul21]

Thanks for checking it out.

I just tried the same, by downloading the fonts from here. https://www.google.com/get/noto/
I think the support for hindi is not there anymore.

https://www.google.com/get/noto/#sans-deva
But the same is happening by using Noto Devanagari font as well.

If it is a font issue, Can any anyone confirm ?