PNG

TIF format

Data compression
Il formato TIF O formato TIF TIF-Format Le format TIF El formato TIF

TIF format

The TIF format (Tagged Image File Format) is a bitmap (raster) graphic file format. It was developed in 1987 by Aldus (now belonging to Adobe). The latest specifications (Revision 6.0) were published in 1992.

Characteristics of the TIF format

The TIFF format is an old graphic format, which makes it possible to store very large (more than 4 GB compressed) bitmap images (raster) losing quality and regardless of the platforms or the peripherals used (Device-Independant Bitmap, which is written as DIB).

The TIFF format makes it possible to store images in black and white, true colours (up to 32 bits per pixel) as well as indexed images, using a palette.

Moreover, the TIF format allows several colour spaces to be used:

Structure of a TIFF file

The principle of the TIF format consists in defining tags (hence the name Tagged Image File Format) describing the characteristics of the image.

The tags make it possible to store information regarding the image dimensions, the number of colours used, the type of compression (many algorithms can thus be used: Packbits / CCITT G3&4 / RLE / JPEG / LZW / UIT-T), or the gamma correction.

Thus, image description using tags makes software programming simple by making it possible to save in TIFF format. On the other hand, the amount of options is so vast, that many image readers supporting TIFF format do not integrate them all, so that it happens that an image saved using TIFF format may not be readable with another.

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