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Technical Discussions
David Harvey
Engineering
ATI - Wah Chang, USA, Joined Nov 2002, 42

David Harvey

Engineering
ATI - Wah Chang,
USA,
Joined Nov 2002
42
09:03 Nov-24-2002
Color palettes for C-scan presentation

We are going to be implementing a new, digital c-scan system at our facility. I am being asked to justify the color palette that we determine to use. We basically have three levels of indication we are concerned with - acceptable, reportable/evaluate, and rejectable.
Does anyone have any information on the preferred combination of colors for such a palette?
Thank you!


    
 
 
Joe Buckley, Sonatest PLc
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 519

Joe Buckley, Sonatest PLc

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
519
00:18 Nov-24-2002
Re: Color palettes for C-scan presentation
David

there are a number of issues here,

Any modern C-scan software should give you a wide variety of colour options. I certainly wouldn't accept something where the colours are 'hard-coded' - You should get an absolute minimum of 16 colours, and preferably 256 or more.


If you want only three colours the 'traffic light' option id readily understood, i.e green good, Red bad, amber/yello marginal. You mave other concerns, such as a selection that will photocopy well.

If you use multiple colours then the normal appraoch seems to be greyscale for interpretation, and 'rainbow' for showing to management.

Joe


: We are going to be implementing a new, digital c-scan system at our facility. I am being asked to justify the color palette that we determine to use. We basically have three levels of indication we are concerned with - acceptable, reportable/evaluate, and rejectable.
: Does anyone have any information on the preferred combination of colors for such a palette?
: Thank you!
.



    
 
 
Tim MacInnis
Senior NDT Engineer
SAIC/Ultra Iamge International, USA, Joined Dec 1999, 10

Tim MacInnis

Senior NDT Engineer
SAIC/Ultra Iamge International,
USA,
Joined Dec 1999
10
01:10 Nov-25-2002
Re: Color palettes for C-scan presentation
If you are implementing a digital system then the user interface should allow a range inherent to the
capabilities of digital equipment. i.e. 16 to 256 bit color definitions. The user should be allowed to limit
the number of colors used. If you are implementing a go/no-go procedure then in the procedure limit the
color usage.
Other features to add or incorporate:
grey scale
reverse palette
scale palette
window palette



    
 
 
David Harvey
Engineering
ATI - Wah Chang, USA, Joined Nov 2002, 42

David Harvey

Engineering
ATI - Wah Chang,
USA,
Joined Nov 2002
42
01:42 Nov-25-2002
Re: Color palettes for C-scan presentation
Thanks for the input. Possibly I should clarify my question - I want to ensure maximum visibility ("seeability" in the old penetrant terminology) of the indications, and am looking for any study or data that might indicate the best combination of colors. Or is gray scale better? Hopefully that clarifies a bit.


    
 
 
Tim MacInnis
Senior NDT Engineer
SAIC/Ultra Iamge International, USA, Joined Dec 1999, 10

Tim MacInnis

Senior NDT Engineer
SAIC/Ultra Iamge International,
USA,
Joined Dec 1999
10
04:19 Nov-26-2002
Re: Color palettes for C-scan presentation
The human eye is especially sensitive to red light, green light, and blue light. The eye is most sensitive to wavelengths in the blue spectrum. The combination of green and red is not the best choice as 7% off the male population can not distinguish between green and red. There were studies performed in the early 60's from Hopkins (MacNichol) as well as Harvard (Wald) regarding the topic.
My suggestion for a minimum color palette is to stay in the blue and red spectrums for indications with a softer background color, yellow/orange, for good areas. I would always have a grey scale option.



    
 
 

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