https://sharpletters.net/2025/04/16/hdr-emoji/

sharpletters

  * about
  * cv
  * archives
  * tags
  * search

Home >> Posts

HDR-Infused Emoji

April 16, 2025 * Corry Haines

Need a little more pop to your Slack emoji? Want to really stand out
when you react with your favorite image?

Turns out you can add HDR emoji to Slack, and they will be rendered
in eye-searing brightness, at least on hardware that supports it.
Works great in Chrome and Slack, and not at all on Android devices.

Examples:#

Note: These examples will work best when posted to Slack. Support in
browsers and on devices varies, YMMV. Known to work in Chrome and
Slack (mostly), and doesn't work in Safari (mostly).

  Original       HDR
[head-empty] [head-empty]
[eye-searin] [eye-searin]

Script#

brew install imagemagick

# Adjust the Multiply value up or down to preserve color as opposed to brightness
magick input.png \
  -define quantum:format=floating-point \
  -colorspace RGB \
  -auto-gamma \
  -evaluate Multiply 1.5 \
  -evaluate Pow 0.9 \
  -colorspace sRGB \
  -depth 16 \
  -profile 2020_profile.icc \
  output.png

You will need the 2020_profile.icc downloaded to your working
directory.

Next >>
JoCo Cruise 2025 - Menus(c) 2025 sharpletters * Powered by Hugo &
PaperMod