That’s great will explore that and see where it goes! BTW all the outliers are positive. i.e. they are the highlights only.
On one hand I agree with you. To do everything properly is way to ambitious, and I never envisioned doing it 100% properly. But I am a firm believer in the 80/20 rule. So far maybe I have 15% of the work complete, maybe with a bit more thought and help I might complete another 5%, which is realistically my limit. This I feel would be an improvement to what’s on offer.
Certainly I have got some good ideas.
Very possible, but I don’t yet fully understand what ‘tonemapping’ is, but I certainly like RT.
Thanks very much once again, especially the image. I was doing some experiments with a step wedge, and doing tests against commercial scanner software. I will explore that properly this week.
That could be my problem…
The equation I posted is supposed to represent the analogue inversion of a film negative. It is presented in a paper by Dunthorn. It took me several days to understand it because I don’t have those skills or brains, but I do understand other crucial parts of the process. In this software space your choices are very restricted and in FOSS non existent (at least that that i am aware of), you can use what is embedded in your scanner software, and the good one is expensive and annoying. However from work flow perspective even the optimal setting by definition creates some clipping, so that’s a restriction in itself. You can of course ignore all that and ‘attempt’ a fix later, that’s essentially what colorperfect does, with a linear scan that is not clipped, or use your own methodology. I am quite happy to purchase colorperfect (and I have) but I then need to work in Photoshop or Photoline.
So my aims are (now):
To create a FOSS solution for inverting negatives that:
- Provides a practical workflow, such that no significant decision needs to taken at scan time. i.e. Scan once and never again.
- Provides a very high quality inversion that needs minimal refinement
- Provides an input into tools like RT that is optimised to complete that minimal refinement.