JaggiesJaggies are undesirable artifacts that can appear when attempting to draw (lines, character glyphs, scaled versions of other bitmaps, etc.) on a bitmap, and result in a jagged appearance to the final result. They also can occur when scaling up bitmap images.
Jaggies can often be mitigated by using a higher resolution bitmap, or by using anti-aliasing.
Let's look at a couple of examples:
For example, let's say that we wish to draw a line between the two blue pixels shown (I have zoomed into the bitmap so that you can see the individual pixels).
An obvious difficulty is that we can't really draw an absolutely straight line, because each pixel can only contain a single color. The best that we can achieve is something like this:
As you can see, this is less than perfect, because the line itself is jagged, and at a several points in the line, there are bumps. In other words, our image suffers from jaggies.
Another situation where jaggies can arise is if we wish to scale (resize) a bitmap up ("interpolation").
Imagine we have the following small bitmap:
While it has some jaggies, it isn't too bad, the lines are as smooth as we can make them given the resolution.
However, if we wish to double the size of the bitmap, we need to add extra pixels ("interpolate"), and we can only do that by duplicating existing pixels. (In this particular example, each pixel in the original image becomes a 2 by 2 block of pixels in the final image).
This results in a much more jagged picture:
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