Both operations compare exactly two images, one pixel position at a time. Neighborhood statistics (local mean, median, or variance) are not part of this group.
Pixel-wise maximum and minimum of two images
Both operations compare exactly two images, one pixel position at a time. Neighborhood statistics (local mean, median, or variance) are not part of this group.
Give it two images; it keeps the brighter, or the dimmer, value at every pixel.