Looks like the “library curve” lacks the precision of the “sample reading” and may falsely lead a person to think they have to cross curves; they are just not showing all the ‘ups-and-downs’.

Metamerism occurs due to the different spectral curves in the illuminant being used to say they are a match. They may cross at a wavelength and drastically change after that. Here is where the difference is evident.

Check out pg 23 http://www.triangledigital.biz/triangle/downloads/L11-029_color_guide_en.pdf
by X-Rite

Other:
http://docs.happycoders.org/unsorted/ai/case_based_reasoning/iccbr-co.pdf

Looks like the “library curve” lacks the precision of the “sample reading” and may falsely lead a person to think they have to cross curves; they are just not showing all the ‘ups-and-downs’.

Metamerism occurs due to the different spectral curves in the illuminant being used to say they are a match. They may cross at a wavelength and drastically change after that. Here is where the difference is evident.

Check out pg 23 http://www.triangledigital.biz/triangle/downloads/L11-029_color_guide_en.pdf
by X-Rite

Other:
http://docs.happycoders.org/unsorted/ai/case_based_reasoning/iccbr-co.pdf

Wonderful info – and great writing.

Okay, so, while I struggle mentally (trust me, not had for me to do, now where did i leave my keys?) on how a color measuring device can possibly remove all the difference between a monitor transmitting light (of one color temperature) and a small section of paper reflection light (of color another temperature) – I am no engineer, so I will buy in to your scenario.

So, lets take this a step further – we are in a professional fashion photography studio, and the model is wearing a fabric that is Pantone 150 (or whatever the equivalent in the new Pantone Goe color is) – but corduroy !

So, lets assume (just for SAG) that we absolutely have a metameric issue (the fabric swatch matches the Pantone swatch in a D50/2 degree environment, but fails in ‘other’ environments – but no matter, we are just trying to get them to match in the press side viewing booth.

We all know the studio lights (scrims, fabric, ect.) and the digital cameras lens and CCD array will introduce new color issues – but if we zero them out of the equation…

Okay, so – in your perfect world – what gadget do we need to capture the color of corduroy and how would you – again – in your perfect world – embed that information so a system might use it (the system could be Photoshop with some fancy plug-in, but it could also be some color managed rip…

Would you use this gadget, or something else;

http://www.xrite.com/product_overview.aspx?id=349

Perhaps this will be Blog post 68-71 !

Michael Jahn
No expertise in particular, but fond of PDF

Wonderful info – and great writing.

Okay, so, while I struggle mentally (trust me, not had for me to do, now where did i leave my keys?) on how a color measuring device can possibly remove all the difference between a monitor transmitting light (of one color temperature) and a small section of paper reflection light (of color another temperature) – I am no engineer, so I will buy in to your scenario.

So, lets take this a step further – we are in a professional fashion photography studio, and the model is wearing a fabric that is Pantone 150 (or whatever the equivalent in the new Pantone Goe color is) – but corduroy !

So, lets assume (just for SAG) that we absolutely have a metameric issue (the fabric swatch matches the Pantone swatch in a D50/2 degree environment, but fails in ‘other’ environments – but no matter, we are just trying to get them to match in the press side viewing booth.

We all know the studio lights (scrims, fabric, ect.) and the digital cameras lens and CCD array will introduce new color issues – but if we zero them out of the equation…

Okay, so – in your perfect world – what gadget do we need to capture the color of corduroy and how would you – again – in your perfect world – embed that information so a system might use it (the system could be Photoshop with some fancy plug-in, but it could also be some color managed rip…

Would you use this gadget, or something else;

http://www.xrite.com/product_overview.aspx?id=349

Perhaps this will be Blog post 68-71 !

Michael Jahn
No expertise in particular, but fond of PDF

Hope you and yours are having a wonderful year. Here are my thoughts about the above.

1. sp: MEtamerism (interestingly, spelling for METAMERIC match is correct)
2. Many store environments have gone or are going to the Westinghouse equivalent of D-50 flourescent tubes in customer viewing areas (Target, Macys, Mervyns, and yes even Walmart are some I know of, off the top of my memory)
3. I have a grad student looking for a project in color matching. Can you suggest how we might approach a packaging solution in a store viewing environment and gather data about the metameric quality of color matching and verify with ColorMetrix and instrumentation? Please advise.

Best regards,

Howie

Hope you and yours are having a wonderful year. Here are my thoughts about the above.

1. sp: MEtamerism (interestingly, spelling for METAMERIC match is correct)
2. Many store environments have gone or are going to the Westinghouse equivalent of D-50 flourescent tubes in customer viewing areas (Target, Macys, Mervyns, and yes even Walmart are some I know of, off the top of my memory)
3. I have a grad student looking for a project in color matching. Can you suggest how we might approach a packaging solution in a store viewing environment and gather data about the metameric quality of color matching and verify with ColorMetrix and instrumentation? Please advise.

Best regards,

Howie