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Author Topic: Making synthetic DNG files  (Read 1281 times)

Jim Kasson

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Making synthetic DNG files
« on: March 11, 2013, 07:29:03 PM »

I've done some testing on resampling in the past using a combination of actual photographic images and synthetic ones. I am now interested in expanding that work to include raw processing, including demosaicing. For that purpose, I would like to make some synthetic mosaiced images that LR, ACR, and other raw processors can work with. I thought my best shot would be to create the images in the DNG format. I guess I could download the DNG SDK and try to figure it out, but I was wondering if anyone knows of a shortcut, like a program that will take TIFFs and data and turn them into DNGs.

Failing that, does anyone know of a suite of mosaiced test images aimed at catching demosaicing and resolution-changing artifacts?

Thanks,

Jim

Schewe

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Re: Making synthetic DNG files
« Reply #1 on: March 11, 2013, 07:38:04 PM »

LR and ACR will both accept TIFF files and save them as Linear DNG (meaning linear gamma but with demosaiced rendering). Don't know of a way to make a synthetic un-demosaied raw image...
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Vladimirovich

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Re: Making synthetic DNG files
« Reply #2 on: March 11, 2013, 08:42:20 PM »


Failing that, does anyone know of a suite of mosaiced test images aimed at catching demosaicing and resolution-changing artifacts?


sure

http://www.libraw.su/data/porcupine.dng
http://www.libraw.su/data/porcupine-blur.dng
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Schewe

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Re: Making synthetic DNG files
« Reply #4 on: March 11, 2013, 10:47:18 PM »

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Bryan Conner

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Re: Making synthetic DNG files
« Reply #5 on: March 14, 2013, 01:45:49 PM »

Wow, that's some serious moiré!

:~)

Holy Batmoiré!
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