In basic terms, how does an image resizer scale *down* an image?

How does it ascertain which pixels to clear out when scaling lower, and nevertheless maintain that integrity in the picture Seeking a reasonably high grade, “basic concept” reason…thanks.

Correct me personally if Im wrong, but you will discover different tactics.

Essentially the most common will be where the image, one ‘colour’ will take up considerably more than ONE PARTICULAR pixel.What as well as is the idea simply reduces as much pixels a single ‘colour’ available as one ‘location’ usually takes, if a person follow.It does this to any or all the colours and all the locations, therefore the image will be smaller.

This can be from storage area, so proper me in the event that I’m incorrect.