Portable Network Graphics Formats (PNG and MNG)

LEADTOOLS reads and writes the following Portable Network Graphics formats:

PNG (Portable Network Graphics), a replacement for the GIF format. It is a full-featured (non-LZW) compressed format intended for widespread use without legal restraints.

LEADTOOLS supports reading (but not writing) interlaced PNG files. To implement the paint-while-load feature, set the LOADFILEOPTION structure's Passes field to paint the image in more than one pass.

You can read the following bits per pixel: 1, 4, 8, 16, 24, 32.

You can write the following bits per pixel: 1, 4, 8, 24, 32.

MNG (Multiple-image Network Graphics) is a raster format was developed in PNG development group and supported by IrfanView, XnView, and ImageConverter. It is a member of the PNG (Portable Network Graphics) format family. It can contain animations, slide shows, complex still frames, comprised of multiple PNG or JNG single-image datastreams..

LEADTOOLS supports progressive reading and writing MNG files, multi-page files (adding, replacing, inserting, and appending), and Lossless JPEG compression. The default extension is MNG.

LEAD supports version 1.0 of this format.

You can read the following bits per pixel: 24.

You can write the following bits per pixel: 1, 2, 4, 8, 16, 24, 32, 48, and 64.

For more information on the format, refer to http://www.libmng.com/.

The file constants associated with these file formats are:

Constant

Read Support (BPP)

Write Support (BPP)

Description

FILE_PNG

1, 4, 8, 16, 24, 32

1, 4, 8, 24, 32

[75] Portable Network Graphics (PNG).

FILE_MNG

24

1, 2, 4, 8, 24, 32, 48, 64

[327] Multiple-image Network Graphics (MNG).

FILE_MNG_GRAY

24

1, 2, 4, 8, 16

[329] Multiple-image Network Graphics (MNG) – Grayscale.

FILE_MNG_JNG

24

8, 24

[330] Multiple-image Network Graphics (MNG) – JNG format.

FILE_MNG_JNG_411

24

24

[331] Multiple-image Network Graphics (MNG) – JNG format with JPEG 4:2:2 Compression.

FILE_MNG_JNG_422

24

24

[332] Multiple-image Network Graphics (MNG) – JNG format with JPEG 4:1:1 Compression.

Required DLL: LFPNG for PNG, LFMNG and LFCMP for MNG. For a listing of the exact DLLs needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Related Formats: GIF - Compuserve GIF Format, JPG - JPEG Compressed.

NOTES: MNG file format is based in part on libmng library.

MNG file format is based in part on the work of the Independent JPEG Group.