Downsample images before uploading them #2749
Description
If an image uploaded to the server is larger than some predetermined dimensions, downsample to that size. (we might want to offer an option to not downsample)
Considerations:
- Instagram uses 1024x1024 images. This seems to work quite well in the majority of cases.
- Phone pictures and screenshots can be 10-20x as big in pixel count / byte zie.
- We can dramatically reduce upload and download speeds in most cases if we reduce size and increase compression levels
- Our downsampling client-side should be more conservative (it is permanent per upload) than the thumbnailing on the server-side
We might experiment with 2048x2048 limit for client-side and 1024x1024 limit server-side (both configurable)
In this thread:
https://chat.zulip.org/#narrow/stream/9-issues/topic/IOS.20app.20emoji.20cutoff
I have demonstrated a 1.46mb mobile screen-shot still being very legible downsampled to 20kb.