Don't bother with the .xls file, it won't work on openoffice as posted because of differences in syntax. The .ods file only contains modifications to correct for the syntax differences between openoffice and excel. If you want to look at the .xls file contents, you could probably just re-save it under a new name and then load, look at, and modify it. If it's really an OS file permissions issue (not just openoffice preventing you from losing data by editing something in .xls that openoffice doesn't deal with correctly), then just right click on the file in the file browser (Nautilus by default) and then click on Properties, then the Permissions tab in the window that opens and give it the read/write/execute permissions you wish it to have. You may need to enter your root password to change permissions.
Lee
Do people see as need for this spreadsheet to also work for 21-step tablets?
Michael
Thanks for your support. I prefer the 31-step version, because it gives more data points, and hence, smoother curves. However, some 35mm workers have trouble reading the thin bars with their densitometers and prefer the wider 21 steps. On the other hand, they could use their enlargers and their enlarging meter if it provides a density function.
Title: Fixing Statistical Errors in Spreadsheet Software: The Cases of Gnumeric and Excel
Content: The open source spreadsheet package "Gnumeric" was such a good clone of Microsoft Excel that it even had errors in its statistical functions similar to those in Excel's statistical functions. When apprised of the errors in v1.0.4, the developers of Gnumeric indicated that they would try to fix the errors. Indeed, Gnumeric v1.1.2, has largely fixed its flaws, while Microsoft has not fixed its errors through many successive versions. Persons who desire to use a spreadsheet package to perform statistical analyses are advised to use Gnumeric rather than Excel.
Contact Information: B. D. McCullough, Department of Decision Science, LeBow College of Business, Drexel University, Philadelphia, PA 19104
I use the Darkroom Automation Enlarging Meter for this purpose. It works very well as a baseboard densitometer, reading in stops with repeatability of about 0.02 stops in my experience. That's 0.006 optical density units. Overkill for a film curve, and less expensive than a decent used densitometer. I use a spreadsheet and type in the stops and let the spreadsheet convert to optical density (simply multiply by 0.3), calculate and subtract fb+f from a 'clear' area of the film, and draw the film curve.
Lee
Support files, specs, and instructions for the meter are at http://www.darkroomautomation.com/ Be sure to look at the support pages for lots of good information.Curious about the set up to use the enlarging meter, would save me the purchase of a densitometer. Thanks.
Thanks Ralph for your generosity with your information.
Is this as simple as taping the step wedge to a window, metering the middle steps for zone V and firing away ?
Would a light table be better with the proper temperature light source ?
Do I need to be concerned about light around the edges of the step tablet or do I need to mask out all light from around the edges of the step tablet ?
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