,dng file support as an OutPut option
Bill Wandersleben
PTGui Support
DNG images after processing are no longer raw files, they are just
repackaged TIFF files. Only when you directly convert a raw file to dng
it will contain raw bayer sensor data.
Technically a 16 bit tiff file from PTGui should give you the same
options and quality as a dng.
Nevertheless DNG output is on the wish list. I'm aware Lightroom is
requiring DNG for certain processing; is this also true for C1?
Kind regards,
Joost Nieuwenhuijse
www.ptgui.com
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Karel Gillissen
Karel
> Op 12 dec. 2021 om 12:20 heeft 'PTGui Support' via PTGui Support <pt...@googlegroups.com> het volgende geschreven:
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> Hi Bill,
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Bill Wandersleben
gs...@gmx.de
RAW data output from PTGui
I would like to have PTGui as a plugin for Lightroom Classic, the reason is as follows:
I want to digitise negatives with the digital camera and take photos in overlapping single shots to increase the resolution. The camera control is to be done from Lightroom and the photographs are also to be further processed in Lightroom, this is to be largely automated in many steps. The workflow is to be as follows:
1)A horizontal xy-traverse moves to the overlapping single positions, the camera takes the RAW images in rows.
2)In Lightroom, the set camera and lens profile and a basic correction is applied to all images: Lens distortion, edge light fall-off, ...
3) From Lightroom, PtGui is opened, which merges the individual images according to the grid arrangement of the shots into a flat and distortion-free panorama and exports it back to Lightroom as a DNG (or Lightroom imports this DNG). This is how it is done with the Lightroom internal panorama software.
4) The individual negatives available as panora images are cropped.
5) Then, if they are colour negatives, they are processed in the Lightroom plug-in filter Negative Lab Pro (https://www.negativelabpro.com/) and converted to positives. Negative Lab Pro requires RAW files and only works in Lightroom. For this reason, the edited images must be RAW files. Lightroom's "merge images" function is not good enough for this, it has difficulties with multi-line panoramas and also with outputting the image rectangular and without bending the edges.
What can I do to get high quality stitched source material for the negative - positive conversion in Lightroom and NLP that has enough colour and dynamic range reserves for the conversion?
Many thanks and best regards,
Gerhard
PTGui Support
DNG output is on the wish list for a future update.
Keep in mind that those DNG files (after stitching or other processing)
are not actually raw files; they are just repackaged TIFF images. It's
more of a marketing decision by Adobe to force you to use DNG input
images than a technical reason. Nevertheless I understand there's a wish
to support this in PTGui.
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gs...@gmx.de
thank you very much for the answer. Do I understand correctly that the panorama function in Lightroom after stitching also only delivers a 16 bit tiff packed in DNG, demosaicked in RGB? Without access to the original Bayer sensor data? Is it possible to stitch raw sensor data at all, or do they have to be converted to tiff and can then only be output as tiff? 16 bit Tiff are huge if you reproduce, for example, an 8x10 inch negative with 45 million pixels per frame with 30% overlap and 1:1 scale of reproduction, this results in 82 individual images with a total of 4.13 GB NEF. I guess that the output Tif 16 bit file is twice as big. As I understand it, the Tiff file is losslessly compressed when packed into DNG, so in this case the DNG will be slightly smaller than the Tiff.
Is that right?
Thank you very much,
Gerhard
PTGui Support
Interpolation can only (practically) be done on demosaiced images.
Stitching panoramas cannot be done without interpolation.
I don't know in what format lightroom stores the stitched image data -
tiff is just a container for different pixel formats, and dng is based
on tiff. But I'm sure the data must have been demosaiced.
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