General Description
The PNG format is intended to provide a portable, legally unencumbered, well-compressed, well-specified standard for lossless bitmapped image files.
PNG is highly recommended as a generalized format for image exchange.
The default extension is PNG.
Supporting Platforms and Applications
This format is supported by numerous applications on a wide range of platforms.
PMView Support
PMView supports the PNG format in full, according to PNG Specification Version 0.96 (11 Mar, 1996). We have coded all the routines from scratch and optimized the code for speed under OS/2, thus PMView does not use the public PNG-library.
Color Type and Bit Depth
Bit Depth Interpretation
0 |
1,2,4,8,16 |
Grayscale images |
2 |
8,16 |
RGB deep color images |
3 |
1,2,4,8 |
Colormapped images |
4 |
8,16 |
RGB deep color images with alpha channel |
6 |
8,16 |
Grayscale images with alpha channel |
Compression Type
0 Deflate/inflate compression with 32K sliding window
Filter Type
0 Adaptive filtering with five basic filter types
Interlace Type
0 No interlace
1 Adam7 interlace