Behavior control when producing bigger webp file than orginal

[hien]

Hello,

I'm using imgproxy in production for webp conversion. I got a problem with several jpegs resulting in a bigger webp in size when converting.

I debugged it via vips command as in discussion libvips/libvips#3147 and found a problem due to images being compressed at low quality level.

At imgproxy side, i've read all imgproxy docs, still not find any config to control behavior when converting this kind of image such as return original image instead...etc.

Thanks

Hien.