The canon Rebel XSi RAW File Format

The Canon Rebel XSi camera has this RAW file format because digital cameras have this
related problem and that decline of picture quality once the image is saved to its memory.
There are assorted type of file formats and they are JPEG and TIFF also this canon Rebel XSi camera file format RAW and we will look into these different file formats opening with JPEG and were the problems are caused.

JPEG is a compression format when images are save to memory they continue a loss in quality of the image and this is called compression loss. When the image is stored by JPEG file format the image is compressed down to about 90 percent to save on camera memory for compression to
realize 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 investment 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 compressionloss
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 of
the 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.