Nice. How are you calculating gamma and contrast index?
This is a modern example of the gamma lambda effect, I measured today with a SensiX blue-green sensitometer. Film used was Fp4+. It shows the contrast change of the material between green and blue exposure.
Thanks for the detailed description. so, for the gamma, you are including the toe, or 'filtering' out the toe?
The tool is written in HTML and JavaScript. I made this together with the use of AI. I make small portions at once with an environment called "Cursor" it allows me to code alongside prompting and is a very quick and efficient way to build stuff like this.Is that C? What is bestFit? is that your own subroutine?
Best Fit refers to the "concentric arc method" The tool needs to test many values in order to find the one best complying with Ci specification. It's like using the Ci ruler but not actually using the ruler. The value found that best fits is taken to work with.Thanks for the detailed description. so, for the gamma, you are including the toe, or 'filtering' out the toe? (OK I see it now, in Gamma Start and Gamma End)
Is that C? What is bestFit? is that your own subroutine?
Best Fit refers to the "concentric arc method" The tool needs to test many values in order to find the one best complying with Ci specification. It's like using the Ci ruler but not actually using the ruler. The value found that best fits is taken to work with.
Are you using a graphing software package or are you writing all the subroutines yourself?
Im using chart.js and for pdf creation i use jsPDF
https://www.chartjs.org/
I can't believe I found posts on this subject. I feel like I am in a time warpI'm a retired photo-analyst who used to design film analysis systems and programs for the govt. and the micrographics industry some 40 years ago. Worked with $ 250K sensitometers and auto scanning densitometers. I wrote software for sensitometric analysis of every kind of film and paper on the planet. Ran many processing and developer studies. If I can be of any help let me know.
Spooky that sounds amazing!
Looks like a fantastic machine.
Another version had a built in radiometer to cross check calibration.
Oh right, a radioactive element that has an absolute luminance reference. I've seen some meters that have those on eBay
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