Compression rates of 10:1 or 20:1 yield little degradation in image quality. Compression rates of 100:1 can be achieved, although the loss is noticeable at that level. JPEG involves a lossy compression mechanism using discrete cosine transform (DCT). JPEG is a joint standard of the International Telecommunications Union (ITU-T T.81) and the International Organization for Standardization (ISO 10918-1). JPG is a graphical file format for editing still images, it offers a symmetrical compression technique which is processor intensive and time consiming in both compression and decompression. In a few seconds the converted files will appear in your browser Downloads folder. Or you can select particular files and click Save Selected to save them. Click Save All on the left if you want to save all the files. Once in Photoshop you can select 'Save for the web' and that should allow you to save as a jpeg that you can send via email and without any color loss. You can adjust the color of the image in Camera Raw if you need to, and then select 'open image'. The JPG file is a great format as it often manages to compress files to 1/10 of the size of the original file which is especially good for saving on bandwidth. Select Open files from computer Select RAW files. From Bridge you can select to open your image into Camera Raw, using a right click. The JPG format is often used in digital camera memory cards. The resultant 'lossy' file means that quality can never be recovered. JPG's are often used for web sites and email as they are generally smaller file sizes as they are lossy meaning that some image quality is lost when the JPG is compressed and saved.
Canon EOS Rebel T3 Series: Choosing the RAW File Type.The CR2 takes over from Canon's previous format - CRW and is used by the Canon 350D, 1D, G9 and 20D models. RAW files are the best quality to size ratio that a photograph can be stored in, primarily because each colour is recorded in either 12 or 14 bits and a lossless compression is used.
You can choose to store your pictures in RAW format which gives you the benefit of being able to do a lot of post processing on the file, if you tried to do this with JPEG, this would be difficult and would likely result in a quality loss. This does not contain a ready to view picture like a JPG or PNG file, it is used to store information directly coming from the sensor. The Canon RAW version 2 (cr2) format is a RAW format created by Canon for storing digital images.