Weird response to adding dark frame (Win10, ART v1.15)

BarryThomas · August 31, 2022, 11:17am

Adding a dark frame to an image gave me a weird result. Anyone else seen this?

Without:

With:

The ISO doesn’t match exactly (400 on scene, 100 on dark frame) but still unexpected Files here:
R5BT6282.CR3 (33.6 MB)
R5BT6282.CR3.arp (11.6 KB)
R5BT100ISO10s.CR3 (17.9 MB)

Thanks for anything you can offer.

Barry

agriggio · August 31, 2022, 11:34am

Looks like a bug, I’ll investigate. In the meantime can you try upgrading to 1.16?

Thanks

BarryThomas · August 31, 2022, 12:28pm

On my way tvm

Upgraded to 1.16.2, same thing happens.

tvm, B.

agriggio · August 31, 2022, 1:51pm

Hi, the dark frame and the shot have different black levels (512 for the df, 2047 for the picture). This is not really supported, you should use a dark frame that matches the picture (same ISO, same exposure, and ideally also same shooting conditions).

Can you try with a dark frame with the same shooting parameters as the picture? If you still get unexpected results, I will look into it, otherwise I’d consider this a non-issue.

HTH

BarryThomas · August 31, 2022, 2:44pm

Ahah, right, that’s great, thanks, will do. Cheers, B.