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You can use DeltaGraph to handle an entire presentation - charts and text - with one application. The results aren’t as stunning as those you can get from dedicated diagramming programs such as The Omni Group’s OmniGraffle, but they’re adequate for many tasks. Double-click on the symbol next to the top-level entry, and DeltaGraph generates a standard organizational chart or a bulleted text list. You enter text into an outliner view that mimics a standard yellow notepad, complete with ruled lines and a red margin.
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Apple’s Keynote achieved the best results by converting our charts into PDF files, but we had to use the Save As PDF feature in Keynote’s Print dialog box to do so.ĭeltaGraph also reaches beyond traditional numerical charting by letting you work with text-based hierarchical data. DeltaGraph supports several export formats, but PDF isn’t one of them. Still, we suspect that most users will opt to transfer DeltaGraph charts to dedicated presentation applications. Once I get the film, by checking a test wedge on a piece of the film I will quickly know a) how many stops slower it is than TMY and b) how close the development info on the digital truth site (if any exists) comes to my favorite development contrast and c) if it has a nice stright line curve.Another feature leverages DeltaGraph’s ability to store multiple pages of charts in a single document it lets you display your graphs sequentially in slide-show format. So, I have Shanghi film on my radar screen. In my opinion its one of the best B&W films ever made, but I don't make enough $$ in my day job to justify $6 a sheet for more right now. Real life example: I'm just finishing up 100 sheets of 8x10 TMY I got for $2 a sheet. So, in this age of 'film of the week,' home testing allows one to check unknown film against name-brand or one's 'favorite' film with respect to relative speed and development.
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Once you have determined a favorite contrast level, I find applying that to unknown film easiest by test wedge exposure. PE, thanks for pointing that as I wanted to make the point that:ġ) I agree that the speed info from the major manufacturer's is good info (in fact that is how I 'calibrate' my sensitometer, and I use name-brand film for the comparison)Ģ) Name brand film is expensive and can be hard to obtain.ģ) Non-name brand film may not have a web site or useful info with respect to speed or developmentĤ) the development info, even from reputable sources, like Kodak, is still just a starting point, even they say so. Realize I did not mention anything about meter calibration or exposing scenes etc.
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So now I'm happy the software spits out both a 'development index' and a 'speed index' for relative film comparisons. So "development index" = "m" from the equationĤ) Then use the "y(x) vs x " buttons to flip the equation and the read off the speed index as the x-intercept, which is "b" in the equation. In fact, after assimilating most of this thread I have settled on the following film analysis plan:ġ) Graph the film test strip datapoints in DeltaGraph ProĢ) Calculate my "development index" (new catch-phrase) as the linear regression of the first 11 points above 0.1 (that area is usually always pretty straight in the B&W films I have tested in the last 10 years)ģ) Get the actual number from the y=mx+b result. But I realized in all the test curves I was playing with, most of them are pretty darn straight. The equation is too complicated to be fit by the DeltaGraph "user defined" function. Steve sent me a pdf of a paper showing a very nice least squares fit to a sigmoid curve. On the newer version by swapping the two I can get my X-intercept speed point easily now (from the linear regression slope of the first 11 points above 0.1) I just realized in my old version the y(x) vs.