About PNG-24 format

The PNG-24 format supports 24-bit color. Like the JPEG format, PNG-24 preserves the broad range and subtle variations in brightness and hue found in photographs. Like the GIF and PNG-8 formats, PNG-24 preserves sharp detail, such as the detail in line art, logos, or illustrations with type.

The PNG-24 format uses the same lossless compression method as the PNG-8 format, in which no data is discarded. For that reason, PNG-24 files are usually larger than JPEG files of the same image. PNG-24 browser support is similar to that for PNG-8.

Like the PNG-8 format, the PNG-24 format supports background transparency and background matting, in which you blend the edges of the image with a Web page background color. In addition, the PNG-24 format supports multilevel transparency, in which you can preserve up to 256 levels of transparency to blend the edges of an image smoothly with any background color. However, multilevel transparency is not supported by all browsers.