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format file png

What is a png file and how do I open a png file?

PNG, or Portable Network Graphics, is a raster graphics file format that supports lossless data compression. PNG was created as an improved non-patented replacement for Graphics Interchange Format, and is the most frequently used lossless image compression format on the Internet. PNG files are compressed raster image files usually implemented for visual elements found in a website among other Web graphics. The image content of these .png files consists of index colors integrated by bitmap images, and the lossless digital image compression and encoding specifications that are implemented into the .png files are similar to the compression standards integrated into GIF files. Also known as portable network graphics, the PNG format was developed to lift the limitations of GIF images, in terms of color support and patent licensing. The transparency channel of these PNG files have been improved to implement 8-bit support. CMYK support is not available in PNG files.

PNG supports palette-based images of 24-bit RGB or 32-bit RGBA colors, grayscale images (with or without alpha channel), and full-color non-palette-based RGB images. PNG was designed for transferring images on the Internet, not for professional-quality print graphics, and therefore does not support non-RGB color spaces such as CMYK.

Mac OS
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Detail png file extension information:
File Type: png
File Format: Portable Network Graphic
Primary Association: Raster Graphics Files
Mime Type: application/png, application/x-png, image/png