More blending modes, like lighten for light trails/streaking lights.
I bought this app for night time light trails/ streaking lights. This is almost there but moving object fade to average instead of streak because it blends dark and light (like the normal blending mode in image editors) instead of being additive like a film camera.
I think ideally you would add all the frames in a HDR 32-bit float image, then adjust the exposure down, or something, but I'm not sure that's practical.
"Lighten only" (see "blend modes" on Wikipedia) should work fast and decently for night time headlight and tail light streaking.
"Darken only" would interesting for streaking of dark objects.
Thanks for listening!
Correct. The incoming images are only 8 bit so the HDR information isn't there to begin with. The image processing happens in 16 bit floating point, but we're still limited in what we can pull out of the incoming images. We'll most likely add additional blending modes along with the other "windowing" idea.
James Thomas commented
After a bit more thinking, you can't really make an HDR from a series of regular shots, because the low dynamic range shots will be missing data in the low range and/or high range. You'll still be mixing with blown out data.
HDRs are made from multiple bracketed exposures. A slow exposure getting detail and color data in the shadows, a fast exposure getting detail in the highlights, so nothing is blown out...
And If there is movement, there's artifacts. The HDR feature in iOS shoots fast, but large movements fail.
So I'm liking the "lighten only" and "darken only" blend modes more.
(I can't imagine other blend modes working great yet, but probably worth looking into.)