Optimization options for PNG-24 format

PNG-24 is suitable for compressing continuous-tone images; however, it produces much larger files than JPEG format. (See About graphic file formats.)

The advantage of using PNG-24 is that it can preserve up to 256 levels of transparency in an image. To save an image with multilevel transparency, select Transparency and choose None from the Matte menu. For more information on the Interlaced, Transparency, and Matte options, see Optimization options for GIF and PNG-8 formats.