I'm not sure this compression is correct?

[rieval]

I tried processing several different images and the results showed that the compressed image size was not much smaller than the original size.

Version: 1.3.5

Command: cavif.exe --speed=5 --overwrite image.jpg

Original size: 9,331KB Compressed size: 8,571KB

CPU: AMD Ryzen 5 PRO 4650U

[kornelski]

There are two factors here:

• When converting from an already-lossy format like JPEG you get worse quality/filesize ratio, because there's no magic that could restore quality that has already been lost, and the new format even wastes bits on preserving distortions added by the JPEG compression. Ideally you should use uncompressed original images as the source, e.g. PNG, or JPEG with an overkill high quality like q=99.

• The speed setting unfortunately matters, and to get best file sizes you have to use slow modes.

[rieval]

Thanks!!