JPM is a JPEG2000 bitmap category file format. The JPEG 2000 Part 6 standard defines that the .jpm extension refers to the JPEG 2000 Composite Image File Format. The JPEG2000 graphic format is a new standard that appeared in 2000 as an update to the JPEG format. He uses a type of technology called wavelet compression, which provides the best ratio of size and quality. The JPM format (i.e., the JPEG 2000 Multi-layer Image Format, ISO 15444-6) was developed for documents that have multiple pages and can be processed as a multi-page photo converter. The purpose of the JPEG 2000 Part 6 composite image format is to work primarily with documents and facsimile images. Compared to regular JPEG 2000 images, a .jpm file is a composite image with many layers. This file can have many pages. Moreover, each such page can have several raster objects. Moreover, in different encodings (JPEG, JPEG 2000, JBIG). They are located in a certain way and make up a single whole. JPM files are used as “digital originals” that store scanned copies of documents and other images and / or texts.
MEF is Mamiya's own RAW format. A high-quality Japanese brand is well known to those who take professional photographs. His story began in the 1940s. It was then that camera designer Seiichi Mamiya and investor Tsunejiro Sugawara created Mamiya. Mamiya ZD cameras are the first mid-format digital cameras. The expanded name of the MEF format is Mamiya RAW Image. He gained fame as a format of "digital negatives". Mamiya has developed this format in order to use it in cameras of its own production. At the same time, the main goal was to store the photos in an uncompressed form, so that later they would be processed without losing quality. The format is built on the principle of a RAW file. It contains a complete set of information that is received from the camera lens. RAW images are uncompressed files. They can be customized using image editing software. They are often preferred by professional photographers, because they are tasked with having high-quality images with many details. An MEF file is capable of storing an image as if it had been made into a CCD camera device. In most cases, it is stored on a memory card, and then transferred to a computer in order to edit and publish.