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PNG to WBMP

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Information about PNG
File extension
png
File category
Raster image file
Stands for
Portable Network Graphics
Developer
PNG development Group(Donated to World wide web Consortium/ W3C)
Overview
These files are commonly termed as ‘ping' and they store the raster files using lossless compression. It came into existence in order to replace the GIF file format as they both have the ability to show transparent backgrounds. Furthermore, it was an enhanced and improved version of Graphics Interchange format. It supports different types of photos. The first one is palette-based photographs that can either have palettes of 24-bit RGB or 32-bit RGBA colours. Second is grayscale images which may or may not have an alpha channel for transparency. Lastly, there is a full-colour non-palette which is based on RGB/RGBA pictures. There is one limitation of this type. It does not support animation like GIF. Besides this, it is non-patented which means there are no copyright limitations.
Technical description
The expanded features like 8- bit channel for transparency and 24- bit RGB support make PNG more popular. The files stores in this format allow the fading of colours from opaque to transparent which is not present in the preceding format. CMYK does not offer support to this extension as it was developed for transferring of files over the internet, not for professional-quality print graphics. It stores information like textual comments, integrity checks and encoded basic pixels in its extensible structure of chunks. It always starts with an 8-byte signature followed by a series of chunks. A chunk furthermore comprises of four parts- length (4 bytes), chunk type (4 bytes), chunk data (length bytes) and CRC- Cyclic redundancy checksum or code (4 bytes).
Links
wikipedia.org

Information about WBMP
File extension
wbmp
File category
Raster Image file
Stands for
Wireless application protocol bitmap format or wireless bitmap
Developer
WAP Forum
Overview
This file extension is capable of storing only monochromatic images that are black and white. This format has become now outdated and it was used by early mobile phones for exchanging and storing the monochromatic pictures that were sent using SMS messaging service. The successor to this is PNG which supports colours. As mobile phones have come up with improved and enhanced features that is why this format has been largely replaced by full-colour image and video formats. This extension has many likenesses with BMP files that is the standard bitmap images. WBMP does not support grayscale images as well as colour images. The size of the file is small and is always kept in reduced size.
Technical description
In this WBMP format, pictures are created by using pixels in which 0 (zero) is assigned to black pixel and 1 (one) is for a white pixel. There are certain fields which are present in this file extension. The field names are as follows along with their purpose. The first one is type, it tells about the type of an image and zero is fixed for monochrome bitmaps. The next is a fixed header and it is always reserved with 0 value. Then comes the width and this defines the breadth of an image in pixels. The second last is the height and it represents the height of a photo in pixels. The last one is data and it tells about the data bytes arranged in rows.
Links
wikipedia.org