Use Dithering to Smooth Edges in GIF and PNG-8 Files

Dithering is a process in which a color is simulated because it is outside of the currently available color palette. This process causes colors to have a somewhat "spotty" or "speckled" appearance because it often requires two or more similar colors, placed next to each other in a checkerboard-style pattern, to approximate a color.

You can use a type of controlled dithering when optimizing web graphics within Photoshop to specify how to handle colors not found within the active color palette. For example, if you have an image with 256 colors in its palette and you then reduce that color palette to 32 colors, you can specify the type of dithering Photoshop should use when remapping the 224 colors no longer in the color palette.

While dithering can be a good thing, because it may smooth some gradations that might otherwise look rough or blocky, it increases the number of colors used and therefore also increases the final file size of a graphic. If that means users must wait longer to view the file, this is a good reason to avoid dithering.

Understanding Adobe Photoshop Features You Will Use

Understanding Adobe Photoshop Features You Will Use

Adobe Photoshop can be a complex tool only because you can do so much with it, however for in this video series, we're going to keep it as simple as possible. In fact, in this video you'll see an overview of the few tools and Adobe Photoshop features we will use. When you see this video, you'll see how you can do so much with so few features, but you'll learn how to use them in depth in the future videos.

Get My Free Video


Responses

Post a comment