Turning SpyderPrint high quality target into i1Profiler target

[Apotheker]

Yesterday I took some time to modify the high quality target of the SpyderPrint package into a i1Profiler target. The 225 high quality target of the Spyder Print package is based on RGB: 5x5x5 + near neutral patches + some grey steps up to 225 patches. Despite the rather low patch count it still seem to produce good profiles using the SpyderPrint package (taking care about the color shift caused by OBA on some papers, making profiling sometimes a nightmare). In the past I had the SpyderPrint package and was never be able to build satisfactory printer profiles (unless with some heavy manipulation on the target and actually cheating on the profile production process).

So I started with the SpyderPrint 225 patch high quality target:



Using a standard 131 patch target in i1Profiler and removing the last 6 patches and adding the additional near neutral patches from the above target I got this in i1Profiler:





The image could be actually printed on a small 10x15 cm photo card and after profiling the result are reallly pretty good comparing it against a print using a profile based on a 918 patch target (based on the famous TC9.18 target):





Above picture shows on the left: above picture using the 918 patch target and underneath with the limited 225 patch target and on the right the target printed on a small 10x15 cm photo card. Printer: Epson ET-8550

--
printers, profiling, refilling, pharmacist @printerknowledge.com

 

[Keith Cooper]

Am I missing something with this?

Given the different underlying 'engine' making the profiles with i1Profiler and the Datacolor system, the fact that the Datacolor one is 'high quality' has little relevance to i1Profiler I'd suggest?

If I needed to make profiles on such small sheets, I'd likely split the target over several sheets or even use the very effective two step refinement process you have with i1Profiler?

Now, as an entirely different thing I'd love to see the Datacolor Software support a new and better measurement device - the Epson SD10 springs to mind...

 

[Apotheker]

Having some time, from time to time I like to see how much measuring points are needed for well behaved rgb printers. Actually I once had a bad behaving ink set which I tried to profile using the Colormunki Photo using the 50 + 2x50 method and there was a strange transition in bright and light blue skies due to a wrong Light Cyan ink bottle which was way too light giving a strange transition.....Using ArgyllCMS + Colormunki that measures more points in the intermediate points between (very) light cyan towards dark cyan I could compensate for this wrong light cyan. The Colormunki software that uses an interpolate method assuming (probably) a more or less linear behaviour of the printer could not predict the intermediate points giving a strange transition.

The ArgyllCMS method (because it measures more intermediate points) could remove this strange behaviour.

The SpyderPrint target uses 5 steps in each RGB-step, which should do a better job.

Consider this as an experiment how good the profile is from SpyderPrint.

 

[Keith Cooper]

Consider this as an experiment how good the profile is from SpyderPrint.

Splendid - I'll always endorse that!

 

[Apotheker]

When combined the Spyderprint 225 high quality target with the gray ramp target I got this in i1Profiler, giving a 450 patch target:





The interesting part is the high patch count around the neutral axis (several (stained) gray ramps), which probably will significantly sample points around the neutral axis much better giving a much better profile tailored for neutral black and white printing. I think this part is interesting to introduce into a higher patch count target using the gray ramp part to increase the amount of sampling around the grey and neutral axis giving a better quality profile at a given patch count.

--
printers, profiling, refilling, pharmacist @printerknowledge.com