Slices produced with strange colors

I have Captivate 5 and working with Windows 7 64 bit.
When Captivate create some slides, these slides have a yelllow color impresed on them that is not on the original recording screen.
What is going on?
Thanks.
RECS

An image is word thousands of words.  Here is the problem.

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    My best regards,
    LUCK

    Pantone is a company, not a color. Pantone produces spot color inks, process color inks, and color references.
    Understand first: Five color printing ("process plus one") is not uncommon, because six-color presses are not uncommon. When a project is printed on a 6-head press, it does not dramatically affect the costs, because the job can still be printed in one pass. Brochures and other marketing collateral are often printed in 5 inks when a company specifies a spot color as its identity color. When done right, the company's identity specifications also provide a CMYK mix to use in lieu of its spot color(s) when restricted to only CMYK (as in magazine placement ads).
    So I'll assume your customer specified a Pantone spot color, and does not provide a preferred CMYK substitute, and your project is restricted to four color process (CMYK) printing.
    CMYK mixes do not exactly match spot color inks; they can only approximate. How closely they can approximate depends upon which spot color you are dealing with.
    Pantone provides its recommended CMYK values for approximating its spot color inks. That's why Illustrator provides a Pantone solid to process Swatch Library. But such lookups are recommendations; they are not absolute equivalents. There are many many colors in nature (and in spot ink pigment) which simply cannot be matched in CMYK. And any time you try to convert between color models (spot to CMYK, RGB to CMYK, etc.) you encounter ambiguities, because there are multiple algorithms that can be used to generate four values from fewer values.
    I often find Pantone's spot-to-process recommendations to be unsatisfactory, and use my own CMYK approximations instead. This is not necessarily due to any failure or shortcoming of the Pantone libraries, but just differences that exist in specific printing houses and workflows. The printing process is full of variables.
    Will I get different colors when changing from Pantone to CMYK
    Yes, the colors will be different. But whether the difference is noticable depends upon the specific spot ink you are trying to match. It also depends upon the specific use of the color. Fact is, human color perception is very adaptive. Colors that are "mathematically" equivilant according to some colorimetric algorithm are not necessarily perceived as equivilant by human eyes, because much depends upon environment (adjacent colors, etc.)
    You can refer to a printed process color reference against which you can compare a printed spot color swatch book and judge for yourself which CMYK values best approximate the spot color. Or, you  can set up simple test sheet of your own, and have it printed to determine a "best match" in a particular printing environment.
    All the above is just one reason why contract proofs are still important. If your customer is very picky about his spot color, then he needs to understand that converting it to CMYK is merely an approximation, and perfect matching is simply not possible. That's one reason why spot inks exist in the first place. If he is not willing to pay for five-color printing, then he will likely have to settle for a minor compromise.
    JET

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