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not sure if you already know about it but I've just started using 'Plot Digitiser', free for home use, see jhuwaldt@users.sourceforge.net
It allows you to take a jpg and exctract the co-ordinates of any points you want (digitising).
I've just been playing around extracting the lines from a jpg of a boat based on a jpg picture downloaded from the web.
It certainly beats measuring by hand from a paper print!
I used it to generate an xml file containg the data points (in pixels), read that file into a spread sheet, then from known points on the print you can apply the offsets & scaling to create the X,Y value you need.
I actually allowed for X & Y scaling to be different (to allow for stretch when scanning the original) and also allowed for a small tilt in the X (horizontal) axis all within the spreadsheet.
I think it can do the scaling itself as it asks for min/max X & Y to start with, but the output files contains the raw pixel co-ordinates as well.
One evening on the PC and I have the basic pressure hull for C class :)
You do have to have java run-time environment, but thats also a reasonably simple job, and your PC may have it anyway as its used by many apps now.
not sure what other image formats it accepts, but pdf aint one!
It allows you to take a jpg and exctract the co-ordinates of any points you want (digitising).
I've just been playing around extracting the lines from a jpg of a boat based on a jpg picture downloaded from the web.
It certainly beats measuring by hand from a paper print!
I used it to generate an xml file containg the data points (in pixels), read that file into a spread sheet, then from known points on the print you can apply the offsets & scaling to create the X,Y value you need.
I actually allowed for X & Y scaling to be different (to allow for stretch when scanning the original) and also allowed for a small tilt in the X (horizontal) axis all within the spreadsheet.
I think it can do the scaling itself as it asks for min/max X & Y to start with, but the output files contains the raw pixel co-ordinates as well.
One evening on the PC and I have the basic pressure hull for C class :)
You do have to have java run-time environment, but thats also a reasonably simple job, and your PC may have it anyway as its used by many apps now.
not sure what other image formats it accepts, but pdf aint one!
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