https://github.com/sunsided/filmdev

Film Developer Parameter Estimation
https://github.com/sunsided/filmdev

artificial-intelligence estimation film-developer film-is-not-dead matlab photography prediction

Last synced: 14 days ago
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Film Developer Parameter Estimation

• Host: GitHub
• URL: https://github.com/sunsided/filmdev
• Owner: sunsided
• License: eupl-1.1
• Created: 2013-12-11T17:52:08.000Z (about 11 years ago)
• Default Branch: master
• Last Pushed: 2013-12-11T19:06:18.000Z (about 11 years ago)
• Last Synced: 2024-11-09T08:21:37.727Z (about 2 months ago)
• Topics: artificial-intelligence, estimation, film-developer, film-is-not-dead, matlab, photography, prediction
• Homepage:
• Size: 172 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Film Developer Parameter Estimation

MATLAB script for estimation of film/developer combination development times based on given combination samples.

## Operation

Using given temperature and sensitivities, this script approximates the function `time(sensitivity)` using logarithmic fitting by finding optimum values `alpha` and `beta` such that 

    time(sensitivity) = sensitivity^alpha + 10^beta 

## Example

An example result of Tri-X 400 in Xtol. The algorithm determined `t(asa) = asa^0.20537 + 10^0.44103` for `Xtol 1+1`, which results in a development time of 6:10 for 400 ASA target sensitivity, 6:42 for 800 ASA etc.

![Example Screenshot](https://raw.github.com/sunsided/filmdev/master/example.png)

## License

Copyright © 2013-2014 Markus Mayer

Film Developer Parameter Estimation is licensed under the EUPL, Version 1.1 or - as soon they will be approved by the European Commission -

subsequent versions of the EUPL (the "Licence"); you may not use this work except in compliance with the Licence.

You may obtain a copy of the Licence at:

[http://joinup.ec.europa.eu/software/page/eupl/licence-eupl](http://joinup.ec.europa.eu/software/page/eupl/licence-eupl)

Unless required by applicable law or agreed to in writing, software distributed under the Licence is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Licence for the specific language governing permissions and limitations under the Licence.