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Here's a .ti3 and ICC profile (standard arguments) for you to have a look at: https://drive.google.com/drive/folders/1Kjj9MPnd6OMTLkTZlTkokXfypu-cS8pP?usp=share_link Notice how the red colorimetric output curve ends at a value of 26? Eventhough the max. black value is indicated as L=4.3, this...

I noticed that RGB printer profiles with "elevated blacks" always have either the R, G or B curve ending with an output value > 0 at an input L = 0. I understand your statement, but in these cases the actual black value when the device output curves R=G=B=0 delivers a lower output L value (thus...

A profile that follows the ICC specs definitely benefits from BPC when printing with rel. col. intent, otherwise you´ll end up with blocked-up shadows. The deeper your black point, the less benefit BPC will bring...what it shouldn´t do is lighten your starting value. Perceptual intent already...

Hold on a second before this derails further :) The issue at hand is a difference in maximum printed black with and without BPC enabled, independent of what is defined as max. black in the profile. I have seen this as well whenever an ICC-profile has output curves that are not converging at...

My bad. I was confused by the filename that mentioned XP15000 ;)

This compares different printers + different profile engines. Also, I don´t see the actual issue mentioned by @pharmacist. The RGB curves nicely converge at the black point. Here is a problematic one that results in raised blacks when selecting BPC when printing. The question is: why does Argyll...

Sure, I agree 100%. That being said, a good DSP can make a tremendous difference...and the same holds true for a good ICC profile. The problem here is a secondary effect that limits the full performance of the system. OP and I want to know why this happens and how to work around/solve it using...

This is a valid concern that I have noticed as well if you print using relative colorimetric rendering. Looking at the output RGB curves for an X-rite profile, you´ll see that the RGB curves reach 0 at or before the input values reach 0 (= pure black input). An Argyll profile often has...

I would use the Adobe Color Print Utility to be 100% sure nothing gets touched in the processing pipeline: https://helpx.adobe.com/photoshop/kb/no-color-management-option-missing.html

Standard, not UV-cut

I´m using a relatively old I1 Pro rev. D spectro.

What is perceived as neutral grey depends a lot on the chromatic adaptation state of our visual system. Simply put: our eye + brain transforms paper white to a neutral tint, so the greyscale has to be shifted to follow that paper white point. This is exactly what the relative col. intent is...

Hmmm...something must have gone wrong there. Troubleshooting: 1. The white point should have no ink printed for the relative intent, but there should be something printed when using absolute colorimetric (measurements seem to indicate so). Is this the case? 2. If 1 == true, does the white point...

I would give Argyll a try and use the "Spotread" command to do single measurements of patches. The output is Lab (D50) by default.

That´s not what I meant. The Lab color space has a relative white point that has to be agreed upon before comparing data. When printing with relative colorimetric rendering, that white point = paper white. This means that blueish-white of your paper has now a=b=0 values. The greyscale follows...

The absolute colorimetric intent forces the source and destination to have a common white point, usually D50. This means that white parts of your images will get a yellow hue. It is also the easiest way to do correct greyscale comparisons as you don´t have to worry about differences in white...

I would expect the patches in the I1Profiler file to be encoded as XYZ data, not RGB. Could this be the issue or do your grey patches actually look non-neutral?

It seems you are not using the embedded ProphotoRGB (gamma=1.8) color space, but likely sRGB or Adobe RGB. I double checked the RGB numbers in the correct color space and it should translate to the LAB values I wrote down. E.g. RGB (prophotoRGB) 100,100,100 = LAB 50,0,0.

As promised: a quick check of the absolute colorimetric accuracy of my printer-profile combo. Printer: Epson Stylus Photo R3000 Profile: 779 patches, ArgyllCMS, X-rite Eye One Rev. D Test target: 8 saturated LAB-values inside the profile gamut + 1 neutral patch printed using absolute...

What I meant was that your analysis compares relative color differences between prints, but not the absolute color accuracy of the profile-printer combination. Never did this either, so I am quite curious as well. I´ll print out a few color patches spread over my R3000´s gamut later this evening...