Anti-aliasing smoothes the jagged edges of a selection by softening the color transition between edge pixels and background pixels
In Photoshop, anti-aliasing smooths these jagged edges by softening the color transition between the edge pixels of the selection, and the background. In doing this additional colors are added.
In Photoshop and other graphic editing programs, many tools by default are set to use various smoothing techniques. For example, Flood Fill tool (Bucket) has Tolerance set to 32, edges of Lasso selection tool are anti aliased and so on. Using these tools with their default settings will result in pixels of various colors added to out designs, and these “generated” pixels will not be of the same colors as our yarn colors.
Here is a video to help you with Anti-aliasing:
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https://embed.notionlytics.com/wt/ZXlKd1lXZGxTV1FpT2lJNFlUZGpaVFZsWldKaU1XSTBNR0kwT0RreVptUmpOR0k0Wm1RelptSTVOaUlzSW5kdmNtdHpjR0ZqWlZSeVlXTnJaWEpKWkNJNkltZDFPSEppYzJwNU9YaFFjRWQ1ZG1wSVkyMU1JbjA9