Saving Images > Saving images in specific formats > PNG format
><

PNG format


Developed as a patent-free alternative to GIF, Portable Network Graphics (PNG) format is used for lossless compression and for display of images on the World Wide Web. Unlike GIF, PNG supports 24-bit images and produces background transparency without jagged edges; however, some Web browsers do not support PNG images. PNG preserves transparency in grayscale and RGB images. For information on when to use PNG format to optimize images, see Choosing a file format for optimization.

To save a file in PNG format:

1 Choose File > Save As, and choose PNG from the format list.

2 Specify a filename and location, select saving options (as described in Saving images), and click Save.

3 Select an Interlace option, and click OK:
  • None to create an image that displays in a Web browser only after downloading is complete.
  • Interlaced to create an image that displays low-resolution versions in a browser while the full image file is downloading. Interlacing can make downloading time seem shorter and assures viewers that downloading is in progress. However, interlacing also increases file size.

    • Saving Images > Saving images in specific formats > PNG format