.JPG/JPEG - JPEG format
.JIF - JPEG image file
- Pixel formats: 8, 24, 32 bits/pixel. YCbCr, RGB, CMYK, YCCK and Grayscale color spaces supported.
- Compression: Extended baseline JPEG support: Both sequential and progressive scan images supported. DCT transform with 8 bits/component data precision. Huffman and Arithmetic encoding. It can read extended precision quantization tables (word size) as well as an extended number of Huffman tables (max. 4DC & 4AC).
- Meta info: Comment, Density, PhotoShop extension (Name, Author, Comment, Copyright, Creation date, Source), EXIF extension (Comment, Source, Time, Copyright, Selected camera settings, GPS location), Adobe XMP (Name, Author, Comment, Copyright, Keywords, Density, Creation date, GPS location).
"Normal" saves a 'sequential mode' baseline JPEG image. "Progressive" saves a progressive extended baseline JPEG image.
Progressive usually results in somewhat smaller files, though they are also slightly slower to load and they are not supported by all applications. "Arithmetic" produces 5-10% smaller files, but unfortunately it is not supported by much software (yet).