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Re: notches on the L*axis

eugene appert wrote:

brightness higher, but I notice the same the thing much farther up the curve. My monitor regesters a distinction between RGB 72 and RGB 73 ( L* 30)
> which is maintained after converting to a target space. For example after a
> conversion to US swop coated v2, RGB 72 & 73 become 66%, 60% 58% 42% and
> 66% 59% 58% 41%, which both translate as L*30.

Graeme Gill wrote: 
You don't say how you are observing this. Beware that some popular
applications (like Photoshop) don't display the full precision of
the underlying color values. They round to the nearest integer in
their readout. Underlying color values are almost certainly a minimum
of 8 bits (256 distinct levels), and might be more than this (16 bit
or floating point).

There's a tiny pipette icon in Photoshop's Info palette. You can use it to adjust the precision Photoshop displays:

- "8bit" shows the usual integer values in the rage of 0...255 for RGB and rounded percentages for CMYK or grayscale

- "16bit" displays values with Photoshop's internal "16bit"-precision (0...32768)

- "32bit" displays floating point values between 0 and 1 with 3 decimal places

Klaus Karcher
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References: 
 >notches on the L*axis (From: "eugene appert" <email@hidden>)
 >Re: notches on the L*axis (From: Graeme Gill <email@hidden>)



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