Add option to specify image quality

[s2b]

It should be possible to specify/overwrite the image quality option. Ideally, it should be possible to specify multiple qualities, e. g. to generate lower-quality for high dpi images.

[DanielRuf]

This is a must have. It seems by default the image quality is lower than the quality of images generated by f:image/media which is not good. (Re)processing should not manipulate / change the quality by default.

At least the generated images seem to be not as crisp as the normal images and look a bit blurry when you look closely at them.

[s2b]

I'm pretty sure that the image quality is the same because the extension uses the core api for image processing just as the core viewhelpers do. The processing is applied to the original image, so there is no reprocessing which could have added up to bad image quality.

However, responsive images can seem blurrier in the browser because they almost almost always will be scaled by the browsers, which can lead to some quality loss.

[DanielRuf]

Well, even in fullscreen there is some quality loss.

[s2b]

Ok, I'll have to test this...