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Questions tagged [lab-colorspace]

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2
votes
1answer
65 views

How to change saturation on a curve in RGB mode, in Photoshop?

In Lab mode it's easy to change saturation independently of luminosity, by using curves on the a and b channels, but how can you do it in RGB mode? In RGB mode it's still easy to change luminosity ...
1
vote
1answer
59 views

In Photoshop, how to get the histogram and statistics of CIELab values

I have a CIELab file that I am looking at with Photoshop. I would like to obtain the mean value of the image's L*, a*, and b* values. However, when I open the Histogram tool and select the individual ...
0
votes
1answer
68 views

Which rendering intent to use when saving CIE-Lab values in Silverfast

I am using Silverfast to make a scan and save it as CIE-Lab. I set Absolute Colorimetric rendering intent in Color Management System preferences, calibrated the scanner, then scanned some white paper ...
1
vote
1answer
58 views

Photoshop CIELab values: What does my display show after color management?

Let's say I load a Lab image into Photoshop, and the Lab values in the image file are D50/2, which is what Photoshop assumes. I then display the image in Photoshop on a monitor which I calibrated ...
1
vote
1answer
43 views

SilverFast CIELab: What illuminant and observer is assumed?

I am scanning prints with the scanner software SilverFast, which offers the option to scan to a file containing CIELab values. However I need to know what CIE illuminant and observer is assumed when ...
10
votes
2answers
879 views

Raw photo for scientific purpose. How to set white reference to defined numeric L*a*b value?

I need a scientific raw photo for colour analysis. I shot with a reference gray card which has a defined Lab color space L=70*a=0*b=0. I need to balance the photo with L=70 in camera raw. Is it ...
-2
votes
1answer
81 views

Change color of an object in Lab that does not share the same channel

Lab tutorials show how to change a red car into a green one. That is convenient, because red and green share the same channel. But, if I would need to change a red car to a Yellow or blue one, how ...
3
votes
1answer
241 views

Does Lab color mode in Photoshop give some advantages over Adobe RGB on skin retouching?

Does Lab color mode in Photoshop give some advantages over Adobe RGB on skin retouching/frequency separation? If yes, in what cases/what advantages does it give? What would be the proper way of making ...