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PNGフォーマットについて

PNG
フルネーム PNG - Portable Network Graphics
ファイルの拡張子 .png
MIME type image/png
によって開発された PNG Development Group
フォーマットの種類 lossless bitmap image format
説明 Portable Network Graphics (PNG) is a raster graphics file format that supports lossless data compression. PNG was created as an improved, non-patented replacement for Graphics Interchange Format (GIF), and is the most used lossless image compression format on the Internet. PNG itself does not support animation at all. MNG is an extension to PNG that does; it was designed by members of the PNG Group.
技術的な詳細情報 PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without alpha channel), and full-color non-palette-based RGB[A] images (with or without alpha channel). 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.
相関プログラム Adobe Photoshop, Paint Shop Pro, the GIMP, GraphicConverter, Helicon Filter, ImageMagick, Inkscape, IrfanView, Pixel image editor, Paint.NET, Xara Photo & Graphic Designer.
ウィキ https://en.wikipedia.org/wiki/Portable_Network_Graphics