What is the difference between JPG and DNG file?
The difference between JPG and DNG file:
There are actually no differences between the JPG and JPEG formats. The only difference is the number of characters used. JPG only exists because in earlier versions of Windows (MS-DOS 8.3 and FAT-16 file systems) they required a three letter extension for the file names. So .jpeg was shortened to .jpg
Used by most digital cameras as their default format, JPEG is the most common file type which can be used online or for hard prints. Its lossy compression algorithm removes minute details that your eye is least likely to notice to save space. However, the compression ratio is adjustable so you can select the level of quality you want in your image. In general, the compression is enough to provide a reasonably high-quality image without worrying too much about the file size.
A drawback of JPEG files is that unlike PNG files, the layers of a JPEG file are flattened. That means you have very limited ability to tweak past edits. Worse, if you edit the same file several times, the edited image may become worse than the original. This image degradation can be a real headache, especially if you are working on lossy formats such as JPEG.
One way to mitigate this problem is to keep an unedited, original version of the file. In that way, if anything goes haywire during the editing process, you can always back to the original version.
DNG is a lossless format similar to ***RAW. However, unlike RAW that uses specific formats based on camera types or manufacturers, DNG stores image data in a compatible, generic format. Thus, even if it is created by Adobe for its applications, any software that can read or convert DNG format can be used.
Converting RAW files to DNG is highly recommended as this will significantly decrease the size of the images, making them easy to download, upload, or send via email. In fact, DNG files are 15 to 20 percent smaller in size than RAW files without any loss of quality.
The DNG format has checksum information that is used to scan and prevent file corruption. Also, enhancements, new features, and extra functionalities are assured since Adobe continuously works on the DNG format.
However, it takes a long time to convert RAW files into DNG. The format also removes unrecognized metadata from RAW files, making it virtually impossible to retrieve such data from DNG files in the future. Finally, since any alteration is written directly into the DNG file, you have to back up the entire file each time a change is made.
RAW files are processed directly from the camera’s sensor, thus they do not use compression. Because they are lossless, the images are extremely high-quality. They show more shades of colors and better representation of white balance, contrast, exposure etc. In addition, changes made to RAW files are non-destructive. Only the metadata that controls the rendering is altered, but the original file data remains untouched.
Obviously, fewer images can be saved in your memory card or hard drive due to the massive amount of data in the RAW file. Also, there is no widespread adoption of a standard RAW format. As such, specialized software may be needed to open RAW files. However, this drawback has been mitigated by using open-source computer programs such as dcraw.
Many photographers, editors, and graphic artists use RAW images during the editing phase. However, they usually save the final result in a more compressed format (most likely JPEG).
There are various options for compression of the jpeg, which display different amount of loss, The original data cannot be restored from a jpeg file. DNG retains all original raw data and is not processed
DNG is the image in raw format. JPEG is compressed image. DNG in mobile phones is the raw data from the camera sensor without processing. While JPEG images in mobile phone got processed _sharpened most of the time_ and saved in less quality than the original.
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