2.2. Reducing the File Size Even More
If you want to reduce the size of your image a bit more, you could
convert your image to Indexed mode. That means that all of the colors
will be reduced to only 256 values. Converting images with smooth color
transitions or gradients to indexed mode will often give poor results,
because it will turn the smooth gradients into a series of bands. This
method is also not recommended for photographs because it will make the
image look coarse and grainy.
Figure 6.7. The indexed image
Use the command described in Section 6.3, “
to convert your RGB image to indexed mode.
After you have converted the image to indexed mode, you are once
again able to save your
image in PNG