Thanks for confirming that dropRGB will produce profiles from the DTP70 output. Do you have a comment on the quality of the results from using the dropRGB profile?
My journey in profiling started with a SpyderPRINT kit a few years ago. It included a Spyder4 Elite for screen profiling and a separate reader for printer calibration. I used it for profiles for my Epson 3880 but was never really happy with the results (muddy shadows but OK mid tones). I also found it difficult to use because the spectrophotometer didn’t slide well while trying to read strips of colour so I mostly used it in single patch mode (tedious and slow but solved by abrading the sticky plastic surface of the scanning guide).
It lead me to trying a ColorMunki which was easier to use and, even though it used fewer colour patches in the target I liked the iterative approach of reading a target then creating another target to fine tune the initial read. However, there was no improvement in the quality of the profile. Again, the shadows are too muddy for my liking.
I should have my DTP70 by the end of next week (shipping from USA to Australia can be a slow process) so I will be able to use the trial version of dropRGB and compare it to the results I have generated from the ColorMunki and the SpyderPrint.
This profiling episode was set off by, like you, resurrecting a dead large format printer. In my case an Epson 7880. I had been putting up with not quite right profiles for the 3880 but, with the bigger format I didn’t want to continue printing stuff that wasn’t doing justice to the printer.
It has quickly become obvious that you could spend a whole lifetime becoming expert in the technology and art of producing profiles and it seems that quite a few have done that. Fortunately, many are generous in sharing their knowledge with others wanting to learn. For that I am grateful.