the Export option, Fireworks' PNGs are competitive with those produced by other image editors, but are no longer editable as anything but flattened bitmaps. Fireworks is unable to save size-optimized vector-editable PNGs. Other notable examples of poor PNG compressors include: Microsoft's Paint for Windows XP Microsoft Picture It! Photo Premium 9 Poor compression increases the PNG file size but does not affect the image quality or compatibility of the file with other programs. When the color depth of a truecolor image is reduced to an 8-bit palette (as in GIF), the resulting image data is typically much smaller. Thus a truecolor PNG is typically larger than a color-reduced GIF, although PNG could store the color-reduced version as a palettized file of comparable size. Conversely, some tools, when saving images as PNGs, automatically save them as truecolor, even if the original data use only 8-bit color, thus bloating the file unnecessarily. Both factors can lead to the misconception that PNG files are larger than equivalent GIF files. Optimizing tools Various tools are available for optimizing PNG files; they do this by: (optionally) removing ancillary chunks, reducing color depth, either: use a palette (instead of RGB) if the image has 256 or fewer colors, use a smaller palette, if the image has 2, 4, or 16 colors, or (optionally) lossily discard some of the data in the original image, optimizing line-by-line filter choice, and optimizing DEFLATE compression. Tool list pngcrush is the oldest of the popular PNG optimizers. It allows for multiple trials on filter selection and compression arguments, and finally chooses the smallest one. This working model is used in almost every png optimizer. advpng and the similar advdef utility in the AdvanceCOMP package recompress the PNG IDAT. Different DEFLATE implementations are applied depending on the selected compression level, trading between speed and file size: zlib at level 1, libdeflate at level 2, 7-zip's LZMA DEFLATE at level 3, and zopfli at level 4. pngout was made with the author's own deflater (same to the author's zip utility, kzip), while keeping all facilities of color reduction / filtering. However, pngout doesn't allow for using several trials on filters in a single run. It's suggested to use its commercial GUI version, pngoutwin, or used with a wrapper to automate the trials or to recompress using its own deflater while keep the filter line by line. zopflipng was also made with a self-own