Luminous Landscape Forum

Raw & Post Processing, Printing => Adobe Lightroom Q&A => Topic started by: Jim Kasson on March 11, 2013, 07:29:03 pm

Title: Making synthetic DNG files
Post by: Jim Kasson 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
Title: Re: Making synthetic DNG files
Post by: Schewe 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...
Title: Re: Making synthetic DNG files
Post by: Vladimirovich on March 11, 2013, 08:42:20 pm
Quote from: Jim Kasson on March 11, 2013, 07:29:03 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
Title: Re: Making synthetic DNG files
Post by: Jim Kasson on March 11, 2013, 08:56:32 pm
Quote from: Vladimirovich on March 11, 2013, 08:42:20 pm
http://www.libraw.su/data/porcupine.dng
http://www.libraw.su/data/porcupine-blur.dng

Very nice.  Thanks!

Jim
Title: Re: Making synthetic DNG files
Post by: Schewe on March 11, 2013, 10:47:18 pm
Quote from: Vladimirovich on March 11, 2013, 08:42:20 pm
http://www.libraw.su/data/porcupine.dng

Wow, that's some serious moiré!

:~)
Title: Re: Making synthetic DNG files
Post by: Bryan Conner on March 14, 2013, 01:45:49 pm
Quote from: Schewe on March 11, 2013, 10:47:18 pm
Wow, that's some serious moiré!

:~)

Holy Batmoiré!