Dithering in image processing is a technique used to simulate colors or shading.
The basic concept behind dithering is adding noise, or additional pixels, to a digital file.
In graphics, dithering adds random patterns of pixels to improve the image quality while avoiding banding.
Juanjo Fernandez / Pixabay
That use differs greatly from dithering as we know it today.
Before the internet had become the polished eye candy we know today, almost all sites were text-based.
The snail-paced speeds of dial-up only allowed graphics to be downloaded at dreadfully slow speeds.
Below is a sample of how printing presses processed high-quality images into a dithered image.
Notice how you might still see distinct colors and shading, but the image is much more pixelated.
More recently, dithering has become popular in web graphics.
Juanjo Fernandez / Pixabay
The first image is a banded image.
you’re able to clearly see the transitions in color.
The second image is a smooth gradient where dithering has been applied.
The banding is no longer visible and produces a much smoother image.
One of the key uses for dithering was to avoid banding in any color or shade gradient.
GIFs are an excellent example of dithering images.
Smaller files require less bandwidth which allows for faster transmission.
In the early days of the internet, dithering was web designers best friend.
They could create more visually appealing websites while being friendly to slower data connections.
Many models of home printers use dithering.
Inkjet printersspecifically spray microscopic dots on paper producing a variety of colors and shades.
Dithering in Photoshop
The other widespread use of dithering in image processing is artistic.
Programs likePhotoshopallow photographers and graphic artists to add exciting nuances to their images.
By applying different pattern overlays to images, you might create some fun and unique images.
it’s possible for you to even replace the colors for dithering by changing your palette.
Dithering is not only a space saver but an adventurous way to express your inner Picasso.
