Too Long; Didn't Read
Usually, when adding an image to a website, the first thing you do is edit the image in an external software, such as Photoshop. <em>Does the </em><strong><em>blend mode</em></strong><em> eliminate the need to use this kind of software?</em> Not really. But, it in a lot of cases you will be able to add effects to the image <strong>directly with CSS</strong>.