Question on workflow to convert DNG (Drone DJI) to JPG

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DeepApnea

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Jul 8, 2021, 8:58:07 AM7/8/21
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Hello PTGui Support

I am looking for an option to convert DNG to JPG before stitching the images using PTGUI, I would like to keep the high quality and details as the raw format (is it possible?). In case of drone images where 26 images are created;  to apply same type of adjustment  for all  pictures may not create a good results. I did stitch DNG (one set of 26 images) and the file size on disk was 60MB compare to 12MB in JPG 

Do you have any recommendation to treat those images before the stitching process in PTGUI?


Thanks 

Iain Munro

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Jul 8, 2021, 11:30:54 AM7/8/21
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I always process the DNGs files first.

Then export them to JPG, then stitch them.

Michał Niedźwiecki

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Jul 8, 2021, 1:55:47 PM7/8/21
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Me too but I save as TIFF 16-bit with ProPhoto RGB color space. Then stitch to JPEG with sRGB color space.


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Michał Niedźwiecki

DeepApnea

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Jul 9, 2021, 1:35:31 AM7/9/21
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Hello, 

Thank you for replying to my question

Any good option to convert DNG to TIFF first? , and same to convert TIF to JPEG...

:)

Michał Niedźwiecki

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Jul 9, 2021, 2:04:42 AM7/9/21
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Advantages of TIFF:
- ProPhoto RGB color space is wider than sRGB
- lossless compression and 16-bit color
but you need ~5x more space on your HDD. It's problem for you?

When you stitch from these TIFF you should have more possibilities for further image processing i.e. brightness correction, color correction etc. 

JPEG is lossy compression. You lose information about the pixels on images. First - you lose information outside the color space than a standard LCD/AMOLED monitor displays (conversion to 8-bit sRGB color space). Second - lose image details out of the human perception (lossy compression). When you do additional image processing, losses will become more visible. Writing to JPEG should be the final operation of image processing.


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Michał Niedźwiecki

DeepApnea

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Jul 9, 2021, 11:07:15 PM7/9/21
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Hello, 

Thanks you 

I'm sharing my results after converting an images from .DNG to .TIF (16-bit) --> .JPG

Image processing is possible using a batch process?,  or is it necessary to carry out AI approach to change certain parameter in the image? . So my idea is to do an image processing after stitching a set of images, do you know any good software with command line options or any capabilities of batch processing? 
DJI_0001.jpg

Michał Niedźwiecki

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Jul 10, 2021, 3:20:05 AM7/10/21
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My workflow:

1/ Open series in Adobe Lightroom
2/ Make develop settings on image with most wider tonal depth
3/ Sync develop settings to other images from series
4/ Make some corrections i.e. decrease exposure on images with sky especially with sun, and increase on images with shadows
5/ select all and export to 16-bit Tiff with ProPhoto RGB color space

6/ Sometimes I'm using Luminar to make some AI filters or Topaz Denoise AI. I'm loading all the series. Make a filter. Sync filter to other images and export all to the next tiffs.

7/ Load tiffs in PtGUI Pro and align. Usually I turn off "Exposure compensation" in Blending because I do it manually at 4/ point in Adobe Lightroom.
8/ Stitch to 8-bit tiff.
9/ Open in Adobe Photoshop
10/ Make some corrections if needed
11/ And publish :)




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