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HTML Form format HTML 4.01 Specification since PDF 1.5; HTML 2.0 since 1.2 Forms Data Format (FDF) based on PDF, uses the same syntax and has essentially the same file structure, but is much simpler than PDF since the body of an FDF document consists of only one required object. Forms Data Format is defined in the PDF specification (since PDF 1.2).
For example, graphically simple images (i.e. images with large continuous regions like line art or animation sequences) may be losslessly compressed into a GIF or PNG format and result in a smaller file size than a lossy JPEG format. For example, a 640 × 480 pixel image with 24-bit color would occupy almost a megabyte of space:
The JPEG (Joint Photographic Experts Group) format can produce a smaller file than PNG for photographic (and photo-like) images, since JPEG uses a lossy encoding method specifically designed for photographic image data, which is typically dominated by soft, low-contrast transitions, and an amount of noise or similar irregular structures.
PICT, PCT – Apple Macintosh PICT image; PNG – Portable Network Graphic (lossless, recommended for display and edition of graphic images) PNJ – a sub-format of the MNG file format, used for encapsulating JPEG files [15] PNM – Portable anymap graphic bitmap image; PNS – PNG Stereo; PPM – Portable Pixmap (Pixel Map) image
OpenEXR – a high dynamic range imaging image file format, released as an open standard along with a set of software tools created by Industrial Light and Magic (ILM). OpenRaster – a format for raster graphics editors that saves layers; PNG – a raster image format standardized by ISO/IEC; QOI – a simple, fast and lossless open source ...
Interleaf PrinterLeaf / WorldView document format (now Broadvision QuickSilver) 6E 2B 31 00: n+1: 344 nii Single file NIfTI format, used extensively in biomedical imaging. 6E 69 31 00: ni1: 344 hdr Header file of a .hdr/.img pair in NIfTI format, used extensively in biomedical imaging. 52 41 46 36 34: RAF64: 0 Report Builder file from Digital ...
In this example, text is the type, html is the subtype, and charset=UTF-8 is an optional parameter indicating the character encoding. Types, subtypes, and parameter names are case-insensitive. Parameter values are usually case-sensitive, but may be interpreted in a case-insensitive fashion depending on the intended use.
Hamilton, Eric: JPEG File Interchange Format, Version 1.02 (PDF, 0.02 MB) 1 September 1992; Recommendation ITU-T T.871: Information technology – Digital compression and coding of continuous-tone still images: JPEG File Interchange Format (JFIF) (PDF and Microsoft Word, 0.2 MB) Approved 14 May 2011; posted 11 September 2012