FFmpeg: Import DNG images

[mkoch]

Hello,

does anybody know how to import DNG images in FFmpeg? The images come from a Canon camera via Adobe DNG Converter. I want to make a timelapse from many DNG images, but the problem can already be shown with a single image. Here is a sample:
http://www.astro-electronic.de/IMG_3459.dng

When I run this command line, the output image is much too dark:
ffmpeg -i IMG_3459.dng -y out.png

Thanks,
Michael

[richardpl]

I know.

[mkoch]

Well, this is a correct answer to my question
Do you want to share some details?

Michael