I've got a Joomla website and that i observe an issue with some images.

In Chrome images look great and sharp however in Opera and IE the pictures aren't that sharp and also the colors are a little strange.

Have a look in the photos below. The main difference is much more apparent around the Standings were the emblems from the teams are actually small.

Any suggestions??

Image using Chrome Image From Chrome

Image using Opera enter image description here

Website Link:

http://world wide web.neasalamis.internet

You are telling the browser to scale the look from 150 pixels to 60 pixels.
Most browsers aren't proficient at that.

You need to create images which are precisely the right size utilizing an image editor.
This provides you with complete treatments for the way the image is scaly (image editors perform a far better job than Opera), making the files more compact too.