Jpeg is quite straightforward of what it is and what is not. DNG is a container, not a format. And it can be ambiguous about what is inside the container.
DNG can be edited in DXO, but not all DNG’s can be edited in DXO and that is because not all DNG’s re the same. Why people insist it misunderstanding the fundamental nature of what DNG is, is beyond me.
“DNG is both a raw image format and a format that supports “non-raw”, or partly processed, images.”
- Digital Negative (DNG) Specification, Adobe.
The latter (non-raw) format is known as “Linear DNG” which is what DXO supports. They have a dedicated page for reasons.
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DNG is a file type that was developed by Adobe Systems Inc. to address a number of issues that surround raw file image processing. It provides a documented file structure that can standardize the way camera information is stored. It also provides some important capabilities for non-destructive parametric image editing.
Introduction
The DNG file format takes its name from the concept of a Digital Negative. It is a file format suitable for the storage of raw digital camera information. It has been developed by Adobe as a standardized file structure for the various kinds of information that live inside an image file.
In addition to standardizing the basic information structure, DNG provides for the storage of other kinds of data that are useful in parametric image editing. This includes processing instructions, image metadata, verification tools, color profiles and more.
While some cameras have adopted the DNG format as an in-camera raw format, it’s also possible to convert files to DNG at some later point in the workflow. Much of the discussion on this page will outline the characteristics and workflow associated with a DNG converted from a proprietary raw file.
DNG provides a very robust and useful workflow tool for modern imaging software, particularly for imaging of digital camera raw files. DNG also provides important functionality for the preservation of your image file – and your processing intent – in a photographic archive.
https://dpbestflow.org/DNG#comparing-raw-dng
"The DNG is based on the TIFF/EP (Tagged Image File Format/Electronic Photography) standard, which is an extension of the widely-used TIFF format. It uses a hierarchical structure of tags to store image data and metadata. DNG is designed to be extensible and flexible, allowing for the inclusion of new tags and features as needed.
In a DNG file, the image data and metadata are organized into a series of Image File Directory (IFD) entries. Each IFD entry contains a set of tags that describe a specific aspect of the image, such as its dimensions, color profile, or compression method. The DNG format also supports the embedding of additional data, such as thumbnail images and proprietary metadata from the camera manufacturer."