Online Tool for curve plotting and analyzation

[Bill Burk]

Or do you mean I should add a feature that allows users to derive luxs from a "perfect" ISO curve and then use this value as a reference for other plots? This to me sounds a bit dodgy. I would probably suggest measuring the actual exposure given by the sensitometer. As the other method introduces many points of uncertainty.

In a consistent sensitometer the exposure will be the same every time. So finding it once is good enough.

 

[reneboehmer]

Small update.

-Ci is now illustrated with the arcs drawn.
-The XY grid steps are now user definable to make for more accurate manual reading of the curves
-The ISO triangle illustration appears as a tickable box once the mode ISO is used.
-A mode that will plot each curve separately in the exported file (It will always show Ci and Delta X illustrations in the single curve plots, like on my picture below.)

 

[reneboehmer]

@Bill Burk
I added the sensitometer calibration for you. There is a small button under the ISO options. (more...) if pressed you can add a “golden curve” this will be used to calibrate the X axis to your sensitometer, with the method described by you earlier.

It does it like this:

• It looks at your reference density data and finds its speed point (the exposure needed to get a density of 0.1 above base+fog).
• It calculates the real exposure in lux-seconds that a film with that box speed should have required according to the official ISO formula.
• It finds the difference between the real value and your sensitometer's value. This difference is your personal "log H offset." A confirmation message will appear showing you this calculated offset value.

From now on (until you clear it or refresh the page), the tool is calibrated.

• The chart's x-axis label will change from "Relative log H" to "Calibrated log H (lux-s)".
• The ISO values calculated for all your other curves will now be absolute ISO speeds based on this calibration.

 

[Bill Burk]

Thanks!

 

[reneboehmer]

Oh, and the tool will show some info here now instead of on the graph directly. That gets too convoluted.In this case, the user selected to see the ISO triangle. The tool will tell the user info about it.

 

[reneboehmer]

Small Update:
-The export will now use JPG instead of PNG files, Pngs were getting to large in file size. The user can chose the JPG compression of the files with a slider.
-An area in the export document with citation of used literature

 

[reneboehmer]

Update:
-The software will now not only interpolate from datasets but also extrapolate from the datasets. If you have too little data, the software will now output "recommended" times and speeds based on second degree polynomial equations. The data that will be "found" this way will be in displayed as Italic in the datasheet PDF. (This is information is not within your own data reach, and is therefore to be taken with a grain of salt. For small overreach it should be ok, but larger gaps should be filled by actual data.)
-A Delta X / Fixed density bug has been fixed. It now again works as intended.
-ISO parts have been renamed to EFS effective film speed

 

[reneboehmer]

Update:
-You can now display curves in dotted and dashed line configurations of your choice. This will help to print on BNW printers and still being able to differentiate between curves.
-You can now choose to show, or not to show, the data points (dots) on the curves.
-You can now choose if you want to see the grid behind the curves.

 

[reneboehmer]

Update to the page,

- you will now be able to perform C41 commercial process control with the tool.
- you will now be able to perform BNW commercial process control with the tool.

You can enter targets for different key values in the process controls and perform daily tests. The tool will plot the tolerance vs days in order to give you an overview of your process stability and quality.

- overall visual style has been streamlined

 

[reneboehmer]

Small update,

The BnW process stability tracker is now a bit more refined and even gives feedback on the last couple of days of process stability, that will let you know if your actions have helped to bring the process back into tolerance. This is mostly for professional use in large scale replenishment systems.

I added full user customizable Action and control limits that will automatically scale into sight. Red is the action limit and yellow the control limit. Green is in tolerance.

You can now also generate a set of test data to import on the site, to see better what the tool actually does.

 

[reneboehmer]