
112 Chapter 2 The Graphics System
Linear-linear filtering. The two mipmap images that bound the pixel are selected.
In each image, bilinear interpolation of the texels is used to generate two colors.
Those colors are linearly interpolated to produce the pixel value. This is some-
times called trilinear filtering.
Note that for each filter, the first name refers to the interpolation type within an
image. The second name refers to the interpolation type across two images.
Of course, it is not yet clear what it means to select the image nearest to the pixel
or to select the two images that bound the pixel. The motivating example discussed
previously made