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Lightroom BW conversion green tint?

dougtatephotography

New Member
Joined
Mar 18, 2020
Messages
9
Lightroom Version
9.4 version
Operating System
  1. Windows 10
Hello,
I've recently started playing with BW conversions in Lightroom. I have one high key photo with a lot of snow that has a very slight green tint. I use a good monitor that I regularly calibrate. I had an 8x12 printed by Bay Photo, with no color correction to see if it appeared the same in print, which it does. I'm just starting to try and learn BW, and would like to know what is causing this, and how I might remedy the problem.
Thank you in advance!
Doug
 
Joined
Mar 29, 2015
Messages
718
Lightroom Experience
Intermediate
Lightroom Version
Classic
I've recently started playing with BW conversions in Lightroom
What feature are you using to convert to B&W?
  • Develop -> Presets -> B&W
  • Develop -> Treatment -> B&W
  • Manually remove Saturation from Channels?
  • etc
It almost sounds like you still have a little bit of green saturation after removing all the other colours.
 
Joined
May 12, 2011
Messages
3,484
Location
Canada
Lightroom Experience
Advanced
Lightroom Version
Classic
Does the histogram also show the green tint? If so, your monitor needs to be re-calibrated.
 
Joined
Jul 2, 2015
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11,227
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Netherlands
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Lightroom Version
A screenshot may not show it anyway. What a screenshot does is capture the data as they are sent to the screen. If your screen is not calibrated correctly, then a screenshot will not show that because the data are correct, but the hardware setting isn’t. Do note that I use the word ‘calibrate’ in its true sense. People often use ‘calibration’ too for the creation of an icc-profile, but that is not what I’m talking about here.
 

dougtatephotography

New Member
Joined
Mar 18, 2020
Messages
9
Not matter how I export it, or print it, it still has a very vague tint to it. On a color image, all it would take is to add a tiny bit of magenta on the tint slider to fix it.
 

David Rigg

New Member
Joined
Apr 8, 2018
Messages
17
Location
Newport, Oregon
Lightroom Experience
Intermediate
Lightroom Version
Classic
Hello,
I've recently started playing with BW conversions in Lightroom. I have one high key photo with a lot of snow that has a very slight green tint. I use a good monitor that I regularly calibrate. I had an 8x12 printed by Bay Photo, with no color correction to see if it appeared the same in print, which it does. I'm just starting to try and learn BW, and would like to know what is causing this, and how I might remedy the problem.
Thank you in advance!
Doug
Hey Doug,

I too got bit in the Butt on a 50-inch canvas using a "Preset" to convert to B&W. It would not have been so evident had I not added a logo with pure blacks and whites.
B4NoSatNoVib.jpg

Although the color picker only shows it as less than two points off from neutral, I found it noticeable and unacceptable. Especially when contrasted with the logo.
color picker.jpg

Pulling down the Saturation and vibrance to -100, totally neutralized the image and the re-print was fine.
NoSatNoVib.jpg


Lesson learned, check the file before sending it to the printer. Had the logo not been there to reference, I probably would have blamed the lab...:) AND as you stated, the shift is too slight to see on even a calibrated monitor. It appears that perhaps the printing process exaggerates the tint? Cheers.
 
Joined
May 9, 2015
Messages
857
Location
Palo Alto, CA
Lightroom Experience
Power User
Lightroom Version
Classic
If the image started out as a color image in the camera (i.e. you are not using a camera with a B&W ONLY sensor or a scanner set to monochorme) and you change the "Treatment" to "Black & White" (which applies profile "Monochrome"), then when the mouse is on the image in the develop module all 3 channels shown under the histogram should have the same value. If they don't then you most likely have not converted it to monochrome. If they do show the same values for the R, G, & B channels but there is a tint visible on the screen, then your monitor may not be calibarted correctly or you have a bad or incorrect video driver for it or there is colored ambient light affecting your perception of the color. For example, if your room lighting is not darkroom dork and you have greenish walls, light reflecting off those green walls will make white pixels on the screen or paper print look greenish.

You may want to grab a "White Balance" card used for white balance calibration (not an 18% gray card used for setitng exposure) and see if the card itself has the problematic tint when held up in front of the monitor. If it does, then it's ambient light causing the problem.

If the White balance card looks white, take a photo of it and convert the image to Traatment Black & White. If it too displayes with a color cast see if the R, G & B values various pixels have the same nummeric values and let us know
 
Joined
Oct 28, 2013
Messages
825
Location
Cheshire, UK
Lightroom Experience
Intermediate
Lightroom Version
Classic
(This may not be relevant, but anyway.....)

I have found that printing a B&W image from Lightroom can give a greenish tinge (I'm printing on a consumer Canon photo printer, but I'm normally happy with it).

I was advised that this is a result of letting Lightroom manage the colour, with colour management in the printer disabled, and that for B&W it is better to reverse that, and have the printer manage colour
 
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