PeterN
On 9/19/2014 12:51 PM, nospam wrote:

nospam
In article <lvharh060h@news4.newsguy.com>, PeterN <peter@verizon.net> wrote:

PeterN
I have found that using high pass on the luminiscence layer in LAB tends to minimize halos.

Savageduck
Actually it is a good idea to do any/all/most sharpening on a luminosity layer, LAB or not.

nospam
not always, since the conversion to lab and back is not lossless.

Eric Stevens
Not strictly correct:

https://www.ledet.com/margulis/ACT_postings/ColorCorrection/ACT-LAB-damage.h tm

">I have always thought that moving from either CMYK or RGB to Lab

nospam
and back was a damage free process, that is, you would end up with the same color co-ordinates when you arrived back from Lab mode.

Eric Stevens
"RGB>LAB>RGB is damage free, but CMYK>LAB>CMYK is not. The damage isn't all that great, so in many images it pays to come out of CMYK so as to take advantage of LAB's strengths; sharpening, however, is not one of these cases. .... Dan Margulis"

PeterN
But you sould know that nosense knows much more than Dan Margulies.

nospam
i do, as do most people, but that's not the point.

read the thread before you say more stupid stuff.

chris murphy and andrew rodney in that thread pointed out dan margulis' errors, and many, many other people do so in other venues. dan is often wrong.

PeterN
And your documents to prove hime wrong are:

It so happens that I often switch between LAB and RGB, and have never see a loss.