Logo image quality poor

The quality of the published logo is very low compared to the quality of the uploaded image.
The uploaded image is bigger than the logo display size so pixelation should not be an issue, does anyone know the reason for this? and how it can be corrected?

Thanks

Hi send your website here or in dm

I have now resolved this issue by changing CSS for logo display in main.css Line22 to

img {max-width:300px; height:auto; vertical-align: middle;horizontal-align:middle;border: 0;
}

ALSO REMOVE -ms-interpolation-mode: bicubic from the css code which causes bluring of logo