Monday, March 23, 2009

AM and FM gamuts compared - part 1 of 2

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8 comments:

  1. Perhaps you could elaborate a bit more as to why the spot size is the crucial factor responsible for this expanded gamut?

    I would have suspected ink trapping differences related to the screening method myself.

    I guess I am not altogether clear as to why a 350lpi screen would increase in gamut compared with an 175lpi screen (to use your example) with all other variables being either, identical or otherwise controlled for.

    Best Regards
    Otherthoughts

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  2. Thank you for your comment.
    I'll cover the reasons why in the next blog.

    best, gordo

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  3. Thanks Gordo,
    For all you're doing here and elsewhere as well.

    Regards
    Otherthoughts

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  4. really useful video, this is very useful if someone wants to understand what the color space of pantone and CMYK gamut is.......
    thanks for your help

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  5. Hey,Gordo

    "FM gamut volume is larger (more chroma) than the AM screened gamut".

    Does it mean the density range of FM image is bigger than AM image? Thanks

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  6. @Anonymous, if I understand your question correctly, no, if by density range you mean solid ink density. Solid ink density can be increased to increase saturation pretty much equally for AM of FM screening.
    The extra gamut FM has is not related to solid ink density, it results from a greater percentage of paper being covered by dots of ink at a given tone value compared to an AM/XM screen. There is also a bit more chroma as a result of the more homogeneous film of ink that FM has compared with AM/XM dots.

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  7. Thanks Gordon. Have a good night:-)

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  8. Anonymous said...
    Gawdo . . . dis is like really cool.
    MARCH 24, 2009 6:41 PM

    Matt Flashner said...
    I like it, and it makes sense if you put it within a different example.

Traffic Lights. Remember when it use to be one huge bulb? They then eventually created a different type of bulb where it would use say a hundred or so tiny bulbs. Why? Two reasons. Efficiency and price. The cost to run all those little bulbs was cheaper then running the huge one. Also, when the huge bulb went out they had to replace it. Now if only one little bulb goes out in the new lights its not that big of a deal. The rest can just run and the light would still be visible.

Same concept here, but different context.
    MARCH 27, 2009 5:25 AM

    Anonymous said...
    Thanks Gordo! Just one more question.

Being that the two primary factors are. Dot-fringe/optical-gain and, FM screen dots are more uniform. 

Would I be correct in assuming that the differences between the AM and FM screening methodologies in this regard, will manifest their greatest effects from the highlights to the mid-tone ranges, thereafter diminishing in distinctiveness as they approach the shadows, and finally becoming identical at the 100%-solid tone? 

Thanks for all your great work Gordo!
Otherthoughts
    MARCH 27, 2009 8:25 PM

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