Re: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
Re: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
- Subject: Re: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
- From: Bill Whitfield <email@hidden>
- Date: Sun, 23 Jan 2011 14:23:49 -0800
Greetings,
Hi Roger. I use MeasureTool for my profiles but had some extra time recently and decided to play with ColorPort. I use a custom 1023 patch target I made in MeasureTool because of having to profile some of our narrow web flexo presses. First thing I noticed is that when I used the same reference file that MeasureTool made for my custom 1023 target to make a target in ColorPort, the layout of the patches was different. After playing with the page sizes in ColorPort, I was able to make the target look the same as the target I created in MeasureTool. I wanted the targets to be the same so I could compare measurements in MeasureTool. Maybe playing with the page size will help you with the format of you IT8 target.
After measuring the target in ColorPort and saving it as a Profilemaker 5 file, I noticed that the patch locations had been shifted so I could not compare in MeasureTool. No matter what format I tried to save from ColorPort, I could not get the saved file to have the same patch location format that I had from MeasureTool.
I then measured the target 3 times in ColorPort and compared them in MeasureTool and found great discrepancies. For instance MeasureTool reported Sigma, Total 1.27. Best 90% 0.31, Worst 10% 2.46 and Maximum Total of 17.88 when comparing 2 successive measurements of the same target using ColorPort. While successive measurements of the same target using MeasureTool reported Sigma, Total 0.07, Best 90% 0.04, Worst 10% and Maximum Total of 0.53.
I was using an iSis (smaller format version) in both ColorPort and MeasureTool and selecting not to cut UV.
Have you done any comparisons such as these?
Since the numbers from MeasureTool are real close to those I get with the 530 I use at press, and the ColorPort numbers are not, I wonder what is going on and about the integrity of measurements from ColorPort.
-Bill-
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