ImageResizer degrades image and image quality

[michelangelo]

Hello, everyone,

I have been experiencing an issues with PW ImageResizer. It usually works quite well but for images with lots of dark areas it seems to degrade the image. Looking through the forum and trying out different settings I came close to what I need but the colours are still off...

Here is the issue:
Original:

 

Converted by ImageResizer to JPG and WebP (WebP is slightly worse):

The settings I have are those: 

array('upscaling' => false, 'cropping' => false, 'quality' => 100, 'hidpiQuality' => 90, 'sharpening' => 'none', 'defaultGamma' => -1);

I have also tried: 
– Changing the color space to  RGB from sRGB in the ImageSizerEngineMagick.php but this didn't work as expected after I read more about it.
– Converted successfully, without any loss in quality, with my local imageMagick. Probably it's a newer version?

Anyways, my question is is this known issue, can something be done about it and if not—can I just use the original image and add a toggle switch on the client side?