Can't Render Emojis Using MiniMagick in Ruby on Rails

Could you please help me with generating images that include emojis?Currently, I'm failing to load the font and getting the following error:

MiniMagick::Error in HomeController#index`mogrify -gravity southeast -pointsize 100 -font Noto-Color-Emoji -fill black -annotate +40+40 😊 /tmp/mini_magick20240912-1-byl3r9.jpg` failed with status: 1 and error:mogrify-im6.q16: unable to read font `/usr/share/fonts/truetype/noto/NotoColorEmoji.ttf' @ error/annotate.c/RenderFreetype/1481.

The code that seems related to this error is as follows:

# controllers/home_controller.rbclass HomeController < ApplicationController  require "mini_magick"  def index    generate_image  end  private  BASE_IMAGE_PATH = Rails.root.join("app", "assets", "images", "base.jpg")  TEXT_FONT_PATH = Rails.root.join("app", "assets", "fonts", "notosansjp.ttf")  EMOJI_FONT_PATH = Rails.root.join("app", "assets", "fonts", "notocoloremoji.ttf")  def generate_image    image = MiniMagick::Image.open(BASE_IMAGE_PATH)    image.combine_options do |c|      c.gravity "northwest"      c.pointsize 24      c.font TEXT_FONT_PATH      c.fill "black"      c.annotate "+40+40", "Foo"    end    image.combine_options do |c|      c.gravity "southeast"      c.pointsize 100      c.font "Noto-Color-Emoji"      c.fill "black"      c.annotate "+40+40", "😊"    end    image.write(Rails.root.join("app", "assets", "images", "image.jpg"))  endend

FROM ruby:3.2.5ARG RUBYGEMS_VERSION=3.3.20RUN apt-get update && apt-get install -y \    fonts-noto-color-emoji \    imagemagick \&& rm -rf /var/lib/apt/lists/*RUN fc-cache -f -vWORKDIR /appCOPY Gemfile Gemfile.lock /app/RUN bundle installCOPY . /app/COPY entrypoint.sh /usr/bin/RUN chmod +x /usr/bin/entrypoint.shENTRYPOINT ["entrypoint.sh"]CMD ["rails", "server", "-b", "0.0.0.0"]

The directory structure is as follows:

directory

The result of the convert -list font command is as follows:

Path: System Fonts  Font: DejaVu-Sans    family: DejaVu Sans    style: Normal    stretch: Normal    weight: 400    glyphs: /usr/share/fonts/truetype/dejavu/DejaVuSans.ttf  Font: DejaVu-Sans-Bold    family: DejaVu Sans    style: Normal    stretch: Normal    weight: 700    glyphs: /usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf  Font: DejaVu-Sans-Mono    family: DejaVu Sans Mono    style: Normal    stretch: Normal    weight: 400    glyphs: /usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf  Font: DejaVu-Sans-Mono-Bold    family: DejaVu Sans Mono    style: Normal    stretch: Normal    weight: 700    glyphs: /usr/share/fonts/truetype/dejavu/DejaVuSansMono-Bold.ttf  Font: DejaVu-Serif    family: DejaVu Serif    style: Normal    stretch: Normal    weight: 400    glyphs: /usr/share/fonts/truetype/dejavu/DejaVuSerif.ttf  Font: DejaVu-Serif-Bold    family: DejaVu Serif    style: Normal    stretch: Normal    weight: 700    glyphs: /usr/share/fonts/truetype/dejavu/DejaVuSerif-Bold.ttf  Font: Noto-Color-Emoji    family: Noto Color Emoji    style: Normal    stretch: Normal    weight: 400    glyphs: /usr/share/fonts/truetype/noto/NotoColorEmoji.ttf

---

Initially, instead of installing the font in the Docker container, I specified the path to the emoji font, similar to how I specified the path to notosansjp.ttf, when rendering the emojis.

...  BASE_IMAGE_PATH = Rails.root.join("app", "assets", "images", "base.jpg")  TEXT_FONT_PATH = Rails.root.join("app", "assets", "fonts", "notosansjp.ttf")  EMOJI_FONT_PATH = Rails.root.join("app", "assets", "fonts", "notocoloremoji.ttf")  def generate_image    image = MiniMagick::Image.open(BASE_IMAGE_PATH)    image.combine_options do |c|      c.gravity "northwest"      c.pointsize 24      c.font TEXT_FONT_PATH      c.fill "black"      c.annotate "+40+40", "Foo"    end    image.combine_options do |c|      c.gravity "southeast"      c.pointsize 100      c.font EMOJI_FONT_PATH # here      c.fill "black"      c.annotate "+40+40", "😊"    end    image.write(Rails.root.join("app", "assets", "images", "image.jpg"))  end

When specifying the emoji font, using the path instead of the font name resolved the error and allowed me to generate the following image.

image1

However, the emojis are either not visible or not rendered.

I tried specifying the font as "DejaVu-Sans" instead of the path, and as shown in the following image, I was able to render the emojis.

image2

However, since it is in black and white and does not support many types of emojis, I want to use the Noto Color Emoji font for rendering emojis.