From eb5c6d03d33f45aa07eb24e8707a25a98e1b60d3 Mon Sep 17 00:00:00 2001
From: 72374 <250991390+72374@users.noreply.github.com>
Date: Fri, 13 Mar 2026 14:57:20 +0100
Subject: [PATCH 1/2] feat: Increase the resolution-limit `WORSE_AVATAR_SIZE`
 from 128 to 256

The file-size of many images will already be smaller than 20 kB,
when encoded at 256x256, and it can be a large improvement in quality.
---
 src/constants.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/constants.rs b/src/constants.rs
index 1eb852b348..d89f2f1289 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -199,7 +199,7 @@ pub const WORSE_IMAGE_BYTES: usize = 130_000;
 // max. width/height and bytes of an avatar
 pub(crate) const BALANCED_AVATAR_SIZE: u32 = 512;
 pub(crate) const BALANCED_AVATAR_BYTES: usize = 60_000;
-pub(crate) const WORSE_AVATAR_SIZE: u32 = 128;
+pub(crate) const WORSE_AVATAR_SIZE: u32 = 256;
 pub(crate) const WORSE_AVATAR_BYTES: usize = 20_000; // this also fits to Outlook servers don't allowing headers larger than 32k.
 
 // max. width/height of images scaled down because of being too huge

From ed7ffdf7f391e3ff4123aebcab60346c679ff70e Mon Sep 17 00:00:00 2001
From: 72374 <250991390+72374@users.noreply.github.com>
Date: Wed, 4 Feb 2026 01:00:04 +0100
Subject: [PATCH 2/2] feat: Change multiplier to 7/8 when scaling down avatars

The resolution-limits for avatar-images are currently 512x512 or 256x256.
Reducing the resolution further, to 2/3 each step, can reduce the quality
much more than is necessary to fit within the file-size-limits,
which are currently 60 kB or 20 kB.

An image made entirely of noise (which results in unusually
large file-sizes), encoded with jpeg-quality 75,
and 4:2:2-colour-subsampling (the format currently used
for encoding images), can be below 60 kB at 227x227.
For the lower file-size-limit of 20 kB,
such images can be too large at 170x170, but fit at 149x149.
More normal images will have a lower file-size at the same resolution.

Before this change, the target-resolutions for resampling were:
512x512 ->                       341x341 ->                       227x227.

And for the lower file-size-limit:
256x256 ->                       170x170 ->                       113x113.

After this change, the target-resolutions for resampling will be:
512x512 -> 448x448 -> 392x392 -> 343x343 -> 300x300 -> 262x262 -> 229x229.

And for the lower file-size-limit, those will be:
256x256 -> 224x224 -> 196x196 -> 171x171 -> 149x149 -> 130x130 -> 113x113.

This does add 2 steps between the previous target-resolutions,
while still reaching target-resolutions close to the previous ones,
to reduce situations in which the quality will be lower than before.
---
 src/blob.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/blob.rs b/src/blob.rs
index 27c44f3e31..46f70a9b2e 100644
--- a/src/blob.rs
+++ b/src/blob.rs
@@ -468,7 +468,7 @@ impl<'a> BlobObject<'a> {
                             ));
                         }
 
-                        target_wh = target_wh * 2 / 3;
+                        target_wh = target_wh * 7 / 8;
                     } else {
                         info!(
                             context,