All screenshots on this blog are pixel perfect, which means that each pixel of the original image is represented by one pixel (or an integer multiple thereof) on your screen. This also means that the pictures are not aspect-corrected.
On a real C64, the displayed pixels are not perfectly square. Instead, they are squished horizontally at a ratio of about 0.936:1. This assumes the computer is a PAL model which was the predominant version in Europe.
For this reason, the images shown here are all a bit wider than they would appear on the real hardware. This is most noticeable with pictures containing spherical objects, like this one:
