Author Topic: Iridient X-Transformer : X-Trans RAF to DNG converter  (Read 105 times)

Pat91

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Iridient X-Transformer : X-Trans RAF to DNG converter
« on: January 09, 2017, 02:05:37 pm »
Hi,

Windows users now have a new tool (IXT - http://www.iridientdigital.com/products/xtransformer.html) allowing to benefit from the vastly superior Iridient RAW processor for X-Trans RAF files. The tool generates a DNG file that can (almost) be considered as a RAW file and be further handled in Lightroom without actually breaking the RAW workflow.

These DNG files still cannot be loaded into DOP because they are still recognized as coming from a X-Trans camera. However there are now much less reasons for DOP to not handle them. The image in the IXT DNG has been already partly demosaiced, so there's no need for DOP to use a specific algorithm (see below the explanations of the IXT author). These files could be handled by DOP exactly like the TIFF or JPEG files.

IXT is still in beta but the current version works like a charm and give dramatically better results than Lightroom with X-Trans files.

Maybe the DxO team should have a look ?

The explanations of the IXT author about his choice of the DNG format :

The DNG image format is openly documented and widely supported by a number of popular photo workflow programs. It also allows for the image data to be preserved in a relatively "RAW" format where final decisions on some critical photo editing processes like exposure, highlight and shadow recovery, white balance and final color rendering can be left to later editing programs.

The DNG image format is based on the very common TIFF image file format. However, TIFF is primarily used to store images in their reasonably final, completely rendered form where decisions on exposure, white balance, tone mapping and color processing have already been applied to a certain degree and are "baked in". In some cases it may be difficult or even impossible to "undo" some of those processing decisions. With the DNG format it is easier to store less processed image data along with associated metadata that allows for more flexibility in changing some of the processing decisions later.

For example, with white balance a TIFF image would typically have white balance settings already applied, whereas with DNG the white balance is typically stored as channel gain metadata that has not been applied to the image data itself. With TIFF the application of white balance will often lead to clipping and some loss of original RAW sensor data that is impossible to be recovered in later white balance edits. On the other hand, with DNG the white balance values can be easily altered in later processing stages while still preserving access to the full fidelity of the original camera RAW image data.
Patrick

 

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