What DPRSplit application is for:
Canon 5D Mark IV's sensor has a somewhat unusual pixel arrangement: each pixel is composed of two subpixels. If Dual Pixel RAW mode is enabled in the camera, the resulting CR2 file contains two images, or two frames: one composite, made from reading both subpixels, summed; and the other is made out of one set of subpixels.
The intended use of this arrangement is to enable some extra editing after the shot: because of the parallax between the subpixels, Canon Digital Photo Professional software allows one to perform microadjustment of focus, bokeh shift, and ghosting reduction.
However, there is one more possible use for a dual-pixel raw, which is not covered by the manufacturer: the second frame, the one that is made out of one set of subpixels, collects half of the light that the composite frame does, as if it was exposed one stop lower compared to the composite frame.
In essence, in Dual Pixel Raw mode, the camera records into one file some equivalent of two shots, bracketed by (approximately) 1 EV.
The DPRSplit application allows one to:
- Extract the second (1 EV down) frame or both frames from Dual Pixel RAW CR2 files;
- And save the extracted frames as DNG files.
Resulting DNG files can then be opened and processed in (practically) any raw converter featuring DNG support.
Download: DPRSplit (Beta 0.8)
- Windows *: Windows 7 – Windows 10, 64-bit
- Mac OX: Mac OS X/macOS 10.6-10.13, 64-bit processor (so, all Intel Macs, except for some models from 2005-06 with Core Solo and Core Duo processors)
- Screen resolution no less than 1600x900
- 50MB of disk space for the application