Hello, my name is Martín, from Argentina. I have a small and new printing company, we work with an EPSON 9890 44", 9 ink plotter.
First of all, I´ve been reading tutorials for 2 hours, and I think who wrote them did a great job compiling the most important subjects in a compact but yet efective and clarifying way (I hope this sounds the same in english as in spanish), so thank you.
I usually print (mostly on cotton canvas) to non professional people who just want to have a memory on canvas. So images are sometimes very poor quality. I ussualy resample them to avoid pixels to be visible and make very little color adjustment to enhance very bright or dark images, and to compensate canvas.
I print using a generic matte canvas and a generic matte canvas ICC profile. Mostly Relative Colorimetric and black point compensation.
My problem, with a lot of this images that are poor quality or somtimes not so poor but they have added effects or filters on Picassa or Instagram is that I get a horrible effect when printing that I can´t see at all on the monitor. It seems to be something like a posterization but I´m not sure what is it and how to avoid it.
For example, the attached files is a couple. Picture was taken and then a filter applied on picasa. When I printed it trying 2 or 3 variations on adjustments black hair was terrible, almost blue, with very defined edges (my printer has k3 inks, 3 different blacks!). The image has very defined areas with no gradation. It is absolutely not posible to see on screen.
If it was a gammut problem I should see it in the gammut warning, and relative colorimetric should try to make it mostly black I think, not blue.
I don´t think it´s a printer issue since sometimes I tried the same at home in a Pixma ip4810 (OCP generic inks) and I get a very similar result. On the other hand I get amazing results with good quality photos.
If this is a common issue or if you can help me avoid it, please let me know.
Thank you all.
Martin.