4 2 2 5 Raster Graphics portable network

4. 2. 2. 5 Raster Graphics: portable network graphics (. png) file BY KRISH DUBEY

What we need to know • It is in a raster or bitmap image file format. • A raster image is made up of a fixed number of pixels [or building blocks] that form a complete image. • The image cannot be enlarged without distortion occurring. (When you zoom in on a raster image, the pixels become visibly grainy. ) • Is an image file type used to offer a clear background or a partially transparent image, and is therefore used primarily for web design.

Statistics • This is an example of performance testing on Vector vs. Raster Map Tiles – a comparative study on load metrics.

Difference between Raster and Vector graphics

Let’s analyse a. png image • A PNG image with an 8 -bit transparency channel, overlaid onto a checkered background, typically used in graphics software to indicate transparency. • Filename extension . png • Internet media type image/png • Type code PNGf, PNG • Uniform Type Identifier (UTI) public. png • UTI conformation public. image • Magic number 89 50 4 e 47 0 d 0 a 1 a 0 a • Developed by PNG Development Group (donated to W 3 C) • Initial release 1 October 1996; 24 years ago • Type of format Lossless bitmap image format • Extended to APNG, JNG and MNG • Standard ISO/IEC 15948, IETF RFC 2083 • Open format? Yes

What do the terms used in the analysis actually mean? • Portable Network Graphics (PNG, officially pronounced /pɪŋ/ PING, more commonly pronounced /ˌpiːɛnˈdʒiː/ PEE-en-JEE) is a raster-graphics file format that supports lossless data compression. PNG was developed as an improved, non-patented replacement for Graphics Interchange Format (GIF). • PNG supports palette-based images (with palettes of 24 -bit RGB or 32 -bit RGBA colors), grayscale images (with or without an alpha channel for transparency), and full-color nonpalette-based RGB or RGBA images. The PNG working group designed the format for transferring images on the Internet, not for professional-quality print graphics; therefore non. RGB color spaces such as CMYK are not supported. A PNG file contains a single image in an extensible structure of chunks, encoding the basic pixels and other information such as textual comments and integrity checks documented in RFC 2083. • PNG files use the file extension PNG or png and are assigned MIME media type image/png. PNG was published as informational RFC 2083 in March 1997 and as an ISO/IEC 15948 standard in 2004.

How to Convert a Raster Image Into a Vector Image In Photoshop HTTPS: //WWW. YOUTUBE. COM/WATCH? V=5 ZX 890 LABFQ

References PNG Home Site libpng Home Page The Story of PNG by Greg Roelofs W 3 PNG Specification Test inline PNG images RFC 2083 More information about PNG color correction The GD-library to generate dynamic PNG-files with PHP A guide to PNG optimization PNG Adam 7 interlacing Encoding Web Shells in PNG files: Encoding human readable data inside an IDAT block. Video - How to convert a raster image into a vector image in photoshop