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sawtooth measurements in scan mode #problems

 

I am getting a sawtooth/jagged line from my measurements of a test chart, when taking the measurements in scan mode, but not in spot mode.

Using an ES-2000 spectro, measuring Piezography test charts in i1Profiler 3.8.4 on Mac OS Ventura 13.5, M1 Max MBP.

I have posted over on the Piezo Pro forum where I'm a member, but this is possibly more related to the spectro or i1Profiler, so I'm assuming relevance to this forum.

?

I get results as expected when taking measurements in spot mode, as so - this is a spot measurement of a 51-step test chart printed on paper using a curve that I have previously linearised and ink limited for that paper to as ‘perfect’ as I could get it, so it is a good reference:

?

But when I take measurements of the exact same test chart print using scan mode, it looks as so:

?

I have left off any smoothing at all just to show the full extent of the difference.
I have checked the sample ID, position and sample name of each measurement in the saved measurements .txt files and can see that i1Profiler looks to be compiling the measurements in the proper order just fine.

Has anyone experienced sawtooth measurements with an i1Pro 2 or ES-2000?

Is it dodgy hardware? Or is it firmware related? If it is to do with it being an ES-2000 then how come spot measuring seems fine?

I get the same outcome whether measuring a 51 step chart or a 129 step chart.

I have tried with the 21x16 and 31x9 charts but - another weirdness - I cannot seem to get past measuring the first line of those charts, I just get told by i1Profiler of a measurement error and that I need to try slower (I am being very slow and precise). Maybe that’s something to do with the .pwxf files for those charts though?!

Any thoughts appreciated.
?
Cheers,
Chris.
--
 

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Hey Chris,

Please attach the measurement data and I can see what is going on. Please include spectral values as well as the normal lab values too. An MXF file format is fine (this has spectral data).

Most likely there is some extra measurement somewhere . . . like it’s measure a combo of the last columns + paper white . . .

Also PPEv2 does not work with 31x9. It was on my list to update that in PPEv2 before getting canned . . . so most likely never will work with 31x9 . . .

Warmest,
-Walker



On Dec 9, 2024, at 12:02?PM, Chris Jack via groups.io <itsmrjack@...> wrote:

I am getting a sawtooth/jagged line from my measurements of a test chart, when taking the measurements in scan mode, but not in spot mode.

Using an ES-2000 spectro, measuring Piezography test charts in i1Profiler 3.8.4 on Mac OS Ventura 13.5, M1 Max MBP.

I have posted over on the Piezo Pro forum where I'm a member, but this is possibly more related to the spectro or i1Profiler, so I'm assuming relevance to this forum.

?

I get results as expected when taking measurements in spot mode, as so - this is a spot measurement of a 51-step test chart printed on paper using a curve that I have previously linearised and ink limited for that paper to as ‘perfect’ as I could get it, so it is a good reference:

<IMG_2365.jpg>

?

But when I take measurements of the exact same test chart print using scan mode, it looks as so:

<IMG_2364.jpg>

?

I have left off any smoothing at all just to show the full extent of the difference.
I have checked the sample ID, position and sample name of each measurement in the saved measurements .txt files and can see that i1Profiler looks to be compiling the measurements in the proper order just fine.

Has anyone experienced sawtooth measurements with an i1Pro 2 or ES-2000?

Is it dodgy hardware? Or is it firmware related? If it is to do with it being an ES-2000 then how come spot measuring seems fine?

I get the same outcome whether measuring a 51 step chart or a 129 step chart.

I have tried with the 21x16 and 31x9 charts but - another weirdness - I cannot seem to get past measuring the first line of those charts, I just get told by i1Profiler of a measurement error and that I need to try slower (I am being very slow and precise). Maybe that’s something to do with the .pwxf files for those charts though?!

Any thoughts appreciated.
?
Cheers,
Chris.
--
 

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One thought I just had too . . . a few people have got i1s that don’t have the little black and white chart on the reader bar. There is a position sensor on the bottom of the i1 that reads a zebra chart on the reader bar (right above the back position anchors). That zebra chart should be on. If it’s not on the reader bar (about 25cm wide of 1mm thick black and white vertical lines) then this is the issue. In that case you would need to change the chart to “classic mode” and re-print and re-read it. (Except for 31x9).

Also, for monochromatic inkjet I’ve migrated to 128x5 and 80x10 now . . . it fixes so many issues . . . although PPEv2 does not allow for that. Richard’s software does though.

warmest regards,
-Walker


On Dec 9, 2024, at 12:08?PM, Walker Blackwell via groups.io <forums@...> wrote:

Hey Chris,

Please attach the measurement data and I can see what is going on. Please include spectral values as well as the normal lab values too. An MXF file format is fine (this has spectral data).

Most likely there is some extra measurement somewhere . . . like it’s measure a combo of the last columns + paper white . . .

Also PPEv2 does not work with 31x9. It was on my list to update that in PPEv2 before getting canned . . . so most likely never will work with 31x9 . . .

Warmest,
-Walker



On Dec 9, 2024, at 12:02?PM, Chris Jack via groups.io <itsmrjack@...> wrote:

I am getting a sawtooth/jagged line from my measurements of a test chart, when taking the measurements in scan mode, but not in spot mode.

Using an ES-2000 spectro, measuring Piezography test charts in i1Profiler 3.8.4 on Mac OS Ventura 13.5, M1 Max MBP.

I have posted over on the Piezo Pro forum where I'm a member, but this is possibly more related to the spectro or i1Profiler, so I'm assuming relevance to this forum.

?

I get results as expected when taking measurements in spot mode, as so - this is a spot measurement of a 51-step test chart printed on paper using a curve that I have previously linearised and ink limited for that paper to as ‘perfect’ as I could get it, so it is a good reference:

<IMG_2365.jpg>

?

But when I take measurements of the exact same test chart print using scan mode, it looks as so:

<IMG_2364.jpg>

?

I have left off any smoothing at all just to show the full extent of the difference.
I have checked the sample ID, position and sample name of each measurement in the saved measurements .txt files and can see that i1Profiler looks to be compiling the measurements in the proper order just fine.

Has anyone experienced sawtooth measurements with an i1Pro 2 or ES-2000?

Is it dodgy hardware? Or is it firmware related? If it is to do with it being an ES-2000 then how come spot measuring seems fine?

I get the same outcome whether measuring a 51 step chart or a 129 step chart.

I have tried with the 21x16 and 31x9 charts but - another weirdness - I cannot seem to get past measuring the first line of those charts, I just get told by i1Profiler of a measurement error and that I need to try slower (I am being very slow and precise). Maybe that’s something to do with the .pwxf files for those charts though?!

Any thoughts appreciated.
?
Cheers,
Chris.
--
 

Cheers Walker.
?
My reader bar does have the zebra strip.
?
MXF file attached. This is a measurement of the Piezography 129 step chart for i1Pro 2 taken in scan mode.
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Piezography-129step-i1Pro2 scan.mxf
Piezography-129step-i1Pro2 scan.mxf

 

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Looks to me like there is some physical things going on . . .

1. Make sure you hold down the trigger while the i1 is entirely on the white of the paper (before hitting the patches). Make sure the light is on.
2. Draw across NOT TOO SLOW. Too slow is actually a problem here.
3. Draw across all the way to the white and wait another half second before letting up off the trigger.
4. Don’t use the non-averaged 129 step target. I’m embarrassed by how badly that one can read sometimes. Best is the 21x16 one honestly. That will read great.
5. Make sure you have a SOLID USB connection. Use a powered USB hub so you can ensure everything is working properly. If it’s a Mac laptop use the USB C port on the top left and make sure you have the Mac plugged in.
6. Clean the white calibration tile.

This should do it.

Best
-Walker


On Dec 9, 2024, at 1:10?PM, Chris Jack via groups.io <itsmrjack@...> wrote:

Cheers Walker.
?
My reader bar does have the zebra strip.
?
MXF file attached. This is a measurement of the Piezography 129 step chart for i1Pro 2 taken in scan mode.
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<Piezography-129step-i1Pro2 scan.mxf>
 

This rings true. Particularly the usb aspect - I noticed a few occasions when the Spectro lost its connection with the computer and had to be unplugged and replugged. I am running from a laptop. I've ordered a powered usb hub and will report back once I've gone through your steps.
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cheers?
--
 

I got it working. Happy days. Thanks for your help Walker!
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I think mainly wot did it was buying a new - good quality - usb C to usb B cable with a ferrite choke on it.
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I had been using the usb A to usb B cable that came with the spectro, but then with a basic usb A to usb C adapter head plonked on it to get into my MBP. Clearly that wasn't stable enough.
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Also I think perhaps I hadn't always been doing steps 1-3 so fastidiously - doing so definitely helps.
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Cheers
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