This is probably the very first image file format I ever came across. I now regard it as an old format for old Windows programs.
|JPEG (jpg, jpeg)||best used to achieve good quality small files|
JPEGstands for "Joint Photographic Experts Group" and was developed to deal with photographs. Nearly every digital camera can save images as jpeg files.
It's the format of choice for nearly all photographs on the web. Frequently used by artists / photographers / bloggers to reduce the size of digital image files for use on the Internet
Use of lossycompression enables a sliding scale of compression which in turn permits choice over the level of compression. However, it also means that frequent editing of the same file will make it degrade over time. Data is lost every time the file is opened and closed using this file format
GIF format (gif)
compatible with simple web graphics using flat colours
gif (pronounced “jiff”) stands for Graphics Interchange Format. It was introduced by CompuServe (I was an early CompuServe user!) and was then subsequently adopted for widespread use on the web
Its use of the lossless data compressiontechnique enables a reduction in file size without any degradation in visual quality
Its main constraint is its limited use of colours. It's suitable for use in graphics which have few colours and use simple shapes (eg diagrams, shapes, logos and cartoon style images). Also good for simple web animations.
It's unsuitable for detailed images and/or those using complex colours and gradients.
|PNG (png)||excellent for image editing; good for web|
|The PNG (Portable Network Graphics) pronounced 'ping' file format was created as the free, open-source successor to the GIF. (Some say that png stands for "PNGs Not GIFs")|
It is a raster format and was designed specifically for image editing and use on the web.
PNG has advantages over GIF:
Adoption of the png format said to be slow due to inconsistent treatment by web browsers.
TIFF (tif, tiff)
high quality file - excellent for printing and photography
|The TIFF (Tagged Image File Format) format is used for storing images. Control over the format is now owned by Adobe|
Originally created with a view to having a standard format for scanners. TIFF became the standard storage format for facsimiles.
Lossless compression is an option. How it saves files depends on the Photoshop version used.
TIFF is more complex than PNG.
The format has not had a major update since 1992.
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Friday, March 19, 2010
Understanding image file formats
What are the different image file formats? Following on from post on Wednesday (Image file formats for artist bloggers) I've created a table for the different file formats used by artist bloggers
I knew some of this - but not all of it before I started - but I do understand it all an awful lot better for having written it all out!