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I have added a new item to the preset editor. This is 'Maximum # of Colors.' It sets the maximum number of colors to use in images created by the GIF and PNG rendering methods. When it is greater than 256, it will create a truecolor PNG image or a 256 color GIF image. This has previously been the normal behavior, and so that no presets are suddenly changed, the default is set to 257. It is useful mainly for creating small palette PNG images or for reducing the number of colors used in a PNG or GIF image. This is useful for reducing the file size. For example, when an image is resized, this multiplies the colors in it. If the original image didn't have many colors, you can often reduce the number of colors in the final image without harming the quality of the image. Generally, when making a PNG or GIF preset, you should experiment with this value and see how low you can get it and still get a good image. It's best to start with 256, then cut the value in half each time, since it's mainly the number of bits used to represent colors that affects file size.