Messages

The only way out of the writing problem is to compress the frames to around 1MB. Canon doesn't need to follow the thread, they already made MJPEG on other cameras.

Just did a conversion to DNG Lossy using Adobe DNG Converter 7.4 and I got file size between 907k and 1136kb instead of 4965kb.

Looked at chdk-dng.c and it is using the old DNG specs 1.3.0.0

It is possible to get LinearRAW jpeg lossy compression in DNG since specs 1.4.0.0 and get a 2:1 to 3:1 compression ratio.

see page.19 http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/products/photoshop/pdfs/dng_spec_1.4.0.0.pdf

You could see some example here : http://blogs.adobe.com/lightroomjournal/2012/10/dng-1-4-specification-notes.html