1. What is Cinema DNG?
CinemaDNG is a file format designed to store high-resolution motion picture in sequential raw format images. This means each frame is independently stored individual files or an MXF (Material Exchange Format) file.

2. How is Cinema DNG different from MOV, AVI, MP4, and other video formats?
Digital video formats are interframe dependent, making each image dependent on the frame before it and the frame after it. Digital video also requires debayering and transcoding from most modern sensors into the video formats color space. With Cinema DNG, the raw camera sensor information can be stored directly into the DNG image file, without in-camera pixel processing or repackaging of the sensor data. This preserves the original image capture and allows for significantly increased flexibility in post production.

3. What software works with Cinema DNG?
The DNG image format is widely used to capture and archive camera raw images for still photography. Tools are available to convert images from over 200 proprietary camera raw file formats to the DNG format. The DNG format specification is now being incorporated into the ISO 12234-2 standard as TIFF/EP Profile 2. There are many companies that make software that is compatible with Cinema DNG, please see a list of companies and associated products here.

4. Which cameras shoot in Cinema DNG?
For many years raw format cameras were rare and usually very expensive. Due to a recent surge in the Digital Cinema camera market, there are now many options in a large range of prices starting as low as $3000. Please see a list of companies and associated products here.

5. How do sequential images look different than interdependent frame video?
Traditional motion picture, captured on film, is a series of still images in a linear progression. When these images are shown rapidly in succession, a viewer has the illusion that motion is occurring. Sequential image formats like Cinema DNG replicate the look and feel of film much closer than interdependent frame video.

6. Why is it important to have a standard format for Digital Cinema?
The CinemaDNG Initiative offers a solution by defining an open file format for digital cinema files to streamline workflows and ensure that digital cinema files can be easily archived and exchanged. By providing a unified, publicly-documented file format, the CinemaDNG Initiative offers several core advantages for camera manufacturers, software vendors, and filmmakers.

7. What are the advantages for filmmakers?
Avoid roadblocks caused by incompatibilities in workflows that involve multiple devices, vendors, and file formats.

8. What are the advantages for camera and software vendors?
Reduce costs and time to market by eliminating the need to develop and maintain proprietary formats and conversion utilities.
Remove a key obstacle to the adoption of new products by providing instant interoperability with existing workflows.

9. How do I integrate Cinema DNG into my current product line?
Become a member, ask Lars.

10. Do I have to license DNG for use?
Nope it’s open source, free license.
11. How does the file size of Cinema DNG compare to compressed video?
Depends on the resolution, but usually about 10 times larger than compressed video.

12. Why do I have to transcode?
Transcoding is the direct digital-to-digital data conversion of one encoding to another, such as for movie data files. Transcoding is commonly a lossy process, introducing generation loss; however, transcoding can be lossless if the input is uncompressed and the output is either losslessly compressed or uncompressed. Raw files like Cinema DNG must go through a transcoding process to be viewable with most modern computers. The transcoding of uncompressed raw files to lossless or uncompressed is technically a lossless conversion because no information is lost, however the process is irreversible and is more suitably known as destructive. Images from most modern digital cameras need to be debayered to be viewed anyway so transcoding and debayering are often done at the same time.

13. What does “debayer” mean?
A Bayer pattern is a color matrix used in most digital cameras to create a color image from a monochrome sensor. The raw output of Bayer-filter cameras is referred to as a Bayer pattern image. Each pixel is filtered in a pattern to record only one of three colors; red, green, or blue. The data from each pixel cannot fully determine color for the area it represents on its own. To obtain a full-color image, various demosaicing algorithms can be used to interpolate a set of complete red, green, and blue values for each point, this is called debayering.
Different algorithms requiring various amounts of computing power result in varying-quality final images. This can be done in-camera, or in PC software, the quality is usually much higher when doing this process on a PC instead of in-camera.

14. Can I play DNG files on the web?
Due to the fact that Cinema DNG files are raw and require debayering to show color information it is currently not possible to play DNG files on the web. In the future as networks and computers get faster this will surely change.

Old Adobe FAQ–anything in here we should keep?