[Ken Maltby]

Originally Posted by PF4Mobile

The industrial applications and business use are a different story.
A business can afford to pay 500$ for an ereader, that is nothing to them
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Perhaps when procuring toys for the executives in the home office, but not
so when providing tools to a workforce, especially a large one. Not so for
the field reader of a heating & airconditioning or plumbing or electrical company.

Let's keep the things in their context and that is regular user, consumer level, retail, ereaders user for learning and leisure reading.
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I was taking a wider view of the potential for these devices and expressing
my thoughts on the factors involved. I think that my estimation of the size
and color relationship is reasonably accurate. Do you have a different opinion?
That relationship would apply to all users.

My question is what are the factors that would make a color eink reader a must!
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I thought that my reply touched on that.

You started with
"comics, Manuals, Presentations, product brochures, textbooks, magazines, ect...
The eInk idea has its place as an outdoor/strong lighting readable device, and for its lower power consumption"

I will address them in reverse order:
-lower consumption- it is lower for B&W ereaders -this is not a reason to get a color ereder
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As I understand it there is no appreciable difference in the power consumption of the eInk displays, B&W vs. Color. There would be a difference with regard to the size of the
displays, I would expect. In any case it is still much better, in that regard, than an LCD
display.

-strong lighting and outdoor-OK compared with tables color eink ereders are an advantage
-comics-you can easily read them on a 300$ tablet. The same goes for everything else if you do not read "text" This is where your eyes get hurt.
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True, you can do more (indoors) with a tablet and even more with a slate PC,
and much, much more with a regular PC.

Form what you mentioned I would keep just "reading outdoor" -there yes you need one although the not sure how strong the colors are compared with table colors in sun light let's say
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The amount of color saturation needed would depend on the use of color for
the application and activity. For instance comparing/reading color coding, or
identifying a change in condition that can be discerned by color, even perhaps
whether the mushroom is edible or not, ect... Not that much would be required
to say identify the functions of different parts of a diagram.

Luck;
Ken