[argyllcms] Re: Colorport CGATS to Argyll CTI3 conversion utility

Bill,
Thanks very much for the info on the missing spectral bands. It doesn't sound like I need to worry about them much.

I had not heard of MeasureTool, (it's part of the ProfileMaker package) so I downloaded it and gave it a try. Here's what I found:

Some of the functionality is disabled without a dongle. You cannot, for instance, print a test chart. This limits you to reading in patch mode only. (No strip mode) Some would argue that this is the only mode to use anyway. I did try a strip chart printed with ColorPort, but the format is not what it expects, and it did not work.

You can read in patch mode. It will import a .ti1 file, and represent the colors to be read correctly. This is an improvement over ColorPort, which expects the RGB values to be in the range 0-255. (For the creation of a test chart, MeasureTool seemed to have the same problem. It would allow me to import the .ti1 file, but not save the resulting chart. In the preview, the colors were too dark, as they are in ColorPort.)

The user interface for measurement is very good. I would say that ColorPort and MeasureTool are equal in this respect. It will export in a CGATS format that is very nearly compatible with Argyll. It would still take a quick edit to at least add a CTI3 tag, before "profile" will accept the file. So, as an additional step is required, ColorPort and MeasureTool are equal here. I don't know if this is because I don't have a dongle, (that just doesn't sound right ;^) but I could export LAB and XYZ values, but no spectral values, as you can with ColorPort.

So, for my purposes, I will stick with ColorPort for now. It will print test charts that can be read in strip mode, and export spectral data.

I do appreciate the input. I had never even heard of MeasureTool. It makes me wonder what else exists right under my nose that I don't know about. A bag of money would be favorite. ;^)

Regards,
   Dave

Bill Birkett wrote:

Dave-

Why not use GM's MeasureTool with your EyeOne? You don't need a dongle to take measurements, and the file it saves can be used directly with Argyll.

Regarding the extra data points. I've measured the same test target with a Pulse using Colorport, and a Spectroscan using MeasureTool, with almost identical results. I don't think these points matter too much. The ISO 13655 colorimetric calculations use measurements from 360-770 nm. But the weighting factors for the wavelengths outside of 400-700 nm are very small.

-Bill



Hello, List!

I've been using an Eye-One with Argyll, capturing measurements with Xrite's Colorport utility. I had been using Perl to "massage" the data from one dialect to another. Not wanting to contribute something in Perl, I've written it in C. It has been compiled with MingW, and gcc under Cygwin. I don't have access to a Mac, but it should not be using any platform-dependant functions. The source has been passed through bcpp, as my coding style differs from the norm.

As user-friendly and polished as Colorport is, I'm bothered by it's spectral range limitation. Although the Eye-One measures from 380 to 730 nm, Colorport limits the reported values to 400 to 700 nm. I don't have a feel for how much benefit the extra 5 bands (380, 390, 710, 720, 730 nm) would provide. Does anyone know what would be gained from the missing data?

Here is the utility, in the hope that some will find it of value.

Cheers,
   Dave

<.c soure file deleted in response>



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