Mattermost-server: Custom emojis that are scaled down look awful

[toojazzy]

Summary

Emojis are not scaled down properly resulting in severe quality drop as compared with other solutions

Steps to reproduce

Add this custom emoji https://i.imgur.com/j4RuUHv.png and use it, it will look awful, try the same in Slack, it will look great, here are the screenshots how it looks:
in mattermost: https://i.imgur.com/OSnsJ4z.png
in slack: https://i.imgur.com/Swj6ScS.png
It happens in linux client as well as in browser (chrome, newest stable)

Expected behaviors

I would expect the emojis to be resized properly

Observed behavior (that appears unintentional)

Instead, the emojis are resized with awful filtering

Possible fixes

I don't know how to fix it, probably use normal scaling method that electron exposes because nothing ever had this problem

[amyblais]

Hi @toojazzy, did you follow these steps to add the custom emoji: https://docs.mattermost.com/help/settings/custom-emoji.html? What Mattermost server version are you on?

[toojazzy]

I followed this method that you posted, the server version is 5.16.0 and client version is 4.3.0, its self hosted, same behavior is happening in the browser as well, I also upload the exact same image I used to make the emote

[amyblais]

@toojazzy Do you see this on Linux only or also other devices?

[toojazzy]

@amyblais It happens on Linux desktop client and on Chrome which is platform independent. My resolution is 1920x1080, on macs retina it looks ok because of the higher DPI.

[amyblais]

@toojazzy Would you be open to testing if you see the same issue on our community server. I wasn't able to reproduce this on Mac, Chrome so far.

[toojazzy]

As I wrote it will not be happening on Macs because it has higher resolution, try it on full HD display, 1920x1080

[amyblais]

@toojazzy I don't have a HD display available, that is why I asked if you'd be open to do a quick test on our community server. I'll ask our team if somebody can help test this.

[gigawhitlocks]

I can reproduce this on my server, version 5.17, Linux desktop client (Fedora), on both my 1440p display as well as my 1080p display.

[amyblais]

Ticket: https://mattermost.atlassian.net/browse/MM-20651.

[toojazzy]

It was not resolved and was marked as Cannot reproduce, why? It is clearly reproducible on non retina displays. Are you serious about issues being sent to you?

[amyblais]

Thanks for letting me know. I've reopened the ticket and sent it back to UX triage to see if it can be further investigated or opened as a Help Wanted issue.