CR2 is a graphic file format developed by the manufacturer of camcorders and cameras Canon. This means that all images made by the equipment of this manufacturer are saved by default in CR2 format (short name from Canon Raw Image File). One of the most attractive properties of images of the specified format is their high quality, even if the file is being edited (color balance, contrast, brightness change). Data for the CR2 format image is obtained directly from the matrix. Among the main drawbacks of the format are the large file size, as well as poor compatibility with other software products.
PDF is short for Portable Document Format, which can be translated from English as “Portable Document Format”. It was developed by Adobe Systems for use by US federal authorities as a tool for storing working documents. This is a universal cross-platform format, which is now standard for electronic documents. It serves to convert text files (including photographs or other images) into electronic documents without any loss. To read PDF files you need special programs - Adobe (Acrobat) Reader, PDF-Viewer and others.