The EOS Rebel XSi Digital SLR Camera RAW File Format

The Canon Rebel XSi camera delivers this RAW file format because digital cameras have this related problem and that loss of picture quality when the image is saved to its memory.
There are Several type of file formats and they are JPEG and TIFF also this canon Rebel XSi camera file format RAW and we will Appear into these different file formats starting with JPEG and were the problems
are caused.

JPEG is a compression format when images are save to memory they bear a loss in quality of the image and this is called compression loss.
When the image is set aside by JPEG file format the image is compressed down to about 90 percent to save on camera memory for compression to accomplish this some data is thrown away and this degrades the quality of the image, this compression system is called discrete cosine transformation and when it compresses it works on a blocks of eight pixel at a time keep some part of the picture and some is lost so the picture is degraded.

There is improvement to the first JPEG file format JPEG 2000 this was phased in to digital cameras to improve on picture quality and the system now used is wavelet compression and this file format creates
less artifacts and better quality of image with 20 percent compression loss also pictures compressed with JPEG file format and most medium range cameras offer a level of compression usually normal compression
high compression or super high and that guide is high compression high degraded image low compression low degraded image.

TIFF stands for tagged image file format this is better file format it takes up more memory space when saved to the camera and these can be saved uncompressed this is a universally readable format and when TIFF
is compressed by LZW (LEMPEL-ZIV-WELCH) the it is compressed by about 50 percent and when the image is uncompressed there is no degrading ofthe image the quality is lost by the camera itself.

RAW file format that the Canon needs Rebel XSi has is better than JPEG and TIFF because the file is unprocessed data and is totally faithful to the image when it was taken only draw back with this format RAW needs its own manufactured software to read it but whichever file format is used the cameras had to be built to take on more memory and they come in the form of memory cards.