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. 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. 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. The pros and cons of the DNG and RAW formats.DNG aims to serve as both a RAW image format as well as non RAW images, also know as Linear DNG. It supports the various forms of metadata - Exif metadata, XMP metadata, IPTC metadata. The format conforms to TIFF specifications and is structured according to TIFF. Adobe developed the Digital Negative format (DNG) as an open lossless RAW image file because they wanted to ensure that the DNG format would satisfy the following objectives (that they felt the RAW file format would not): digital image preservation (sometimes known as archiving), easy and/or comprehensive exploitation by software developers, in-camera use by camera manufacturers and multi-vendor interoperability.Ī DNG file contains a JPEG preview, with metadata and data for the one main image.
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