Image downsampling options for received attachments

[benjaoming]

• I have searched open and closed issues for duplicates

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Bug Description

Contrary to #2907 asking for larger attachment sizes, I wish that there was more control of image sizes and features for automatically resizing photos.

The recipient of a message should be able to control the storage space consumed, when deleting the entire message is too dramatic. Often people send high resolution photos because smartphones come with bloated megapixel specs.

Main features

• Specify a set of downsampling presets
• For a received group of photos choose a preset, which will then scale down
• For sending photos, have the same symmetric option to choose "downsample to [Preset X] before sending".

Presets

Since screenshots and other lossless formats are normally generated to be lossless and downsampling is rarely desired, I think we can focus on JPEGs.

• Max. width/height
• JPEG quality

Standard presets: High res JPEG (80% quality, 2048x1536), Medium res JPEG (80%, 1600x1200), Small (JPEG 1280 x 1024)

See: https://lifeinlofi.com/more/iphone-photo-sizes-2007-2013/

Other ideas:

• Choose a per-contact down and per-group downsampling preset to apply to anything received
• Choose to always downsampled sent photos

Steps to Reproduce

n/a

Screenshots / mockups

I don't think this feature needs mockups or illustrations. Mainly, it's about adding a checkbox "downsample" and a select box for 3 available presets. Or even just 1 preset is enough, then the choice is just "no downsample" vs. "downsample to configured setting".

A simple image resize for Thunderbird with a prompt and a preview - but that's too much IMO! https://addons.thunderbird.net/en-US/thunderbird/addon/shrunked-image-resizer/?src=search

A bit of inspiration perhaps from Thunderbird's add-on, which is a very very advanced version to scale images before sending emails - and of course way too advanced for Signals general approach: https://addons.thunderbird.net/en-US/thunderbird/addon/auto-resize-image/?src=search

Platform Info

n/a

Link to Debug Log

n/a

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[benjaoming]

I'm not going to discuss this in community forums, but I could hope that others have time if this is necessary to suggest improvements of Signal.