Bob, If you have Excel, you should be able to set up a curve from your data sets. Enter and just let in plot away ( after you set up the initial input/output in curves) Eric Neilsen Photography 4101 Commerce Street Suite 9 Dallas, TX 75226 http://e.neilsen.home.att.net http://ericneilsenphotography.com _____ From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of BOB KISS Sent: Friday, September 01, 2006 8:37 AM To: Pure-Silver@Freelists. Org Subject: [pure-silver] D-LOG E CURVE DRAWING PROGRAM DEAR PURE SILVER, Does anyone know of a curve drawing program that I can use to plot D-Log E curves from the densities that I read off the test strips I create with my step wedge? To begin with I will use my densitometer. Later I may try it with my scanner but, for now, please let me know about a program where you can set the X axis at steps of .15 Log E units and the Y axis as Density and pump in the readings from my densitometer. I am hoping that there is a program that draws and smoothes the curve to fit the data. Of course I would prefer a free download or to be told that it already exists in my computer hidden in some Windows accessories program but I will buy it if I must. Thanks in advance. CHEERS! BOB Please check my website: <http://www.bobkiss.com/> http://www.bobkiss.com/ "Live as if you are going to die tomorrow. Learn as if you are going to live forever". Mahatma Gandhi