Making synthetic DNG files

[Jim Kasson]

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]

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...

[Vladimirovich]

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

[Jim Kasson]

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

Very nice.  Thanks!

Jim

[Schewe]

http://www.libraw.su/data/porcupine.dng

Wow, that's some serious moiré!

:~)

[Bryan Conner]

Wow, that's some serious moiré!

:~)

Holy Batmoiré!