I recently converted a colour image to b&w in Lightroom and for some reason parts of the image preserved some of its colour. Transfering the same image to Photoshop and changing the mode to greyscale corrects the problem. I have never experienced this issue in Lightroom before. Any recommendations?
How did you do this conversion to B&W? Please give us step-by-step details.
One thing to check is that colour grading / split toning, and also Tone Curve when set to varied RGB info, can introduce non-grey hues even when an image is fully B&W - or, has been otherwise adjusted to fully appear so.
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Tint after BW Conversion can come from two places:
1. Local adjustment with a Tint swatch applied
2. Color Grading/Split Toning.
Those would be places to look.
If you move Vibrance and or Saturation to -100, what do you see (and does the info numbers in the Histogram show that R=G=B)?
As it turns out, I had some selective masking applied from a previous edit. This became obvious after inspecting the history. I performed a reset on the image and applied the b&w treatment again with the desired results. Thank you all for your responses.