Fan of Printing
- Nov 3, 2021
- Reaction score
- Printer Model
- Canon G570, EPSON L800/L3150
Oops , I forgot to note the date. Edited.That's a pretty compehensive test you have started here, please make a note somewhere which time period the measuered values are for.
I agree with you that a mix of CMY dye inks and a pigment black don't go well together in such test, some Epson ink sets come with a dye black, that would need to be measured. I'm using the 106 photo black as a substitute for the pigment black, it impacts the summary deltaE value the least .
You are using the DeltaE(2000), I'm using the DeltaE(76), it does not really matter, since I'm not doing a visual assessment I don't really care about the differences how and why they are calculated differently - to bring the numbers closer to a visual perception of wider color variances. I'm looking for a ranking as the outcome of such testing for the inks and papers under test and an understanding how these react differently - turning brown - causing a bluesih or reddish color cast at the end etc.
Which numbers are you recording in the 'White' column ? Are you measuring the white point of the paper ? Or the luminance change of a given patch ?
If you measure the white point separately you may catch the effect of the vanishing effect of the optical brightener in the paper , and the white point will shift from a blueish tone to a yellow tone. An OBA will fade as well like the other dye inks.
The weather forecast for the next week seems like only 3 days sunny. Might check again after 2 weeks or more.
Maybe I would change to DeltaE(76) next time.
I am measuring the 'white' patch , seems like I am observing the OBA fade on the paper for reference.