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dmstraker

What's the difference between desaturation and Black and White adjustment

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What is the technical difference between desaturating with HSL adjustment and using the Black and White adjustment?

An example: Take Monet's 'Sunset in Venice':

tone_contrast_monet.png.00336769356f9ed28bc90993891eb405.png

Now turn down the saturation to zero.

tone_contrast_monet_desaturated.jpg.ac871a755a889f33c9f108b6f3df6526.jpg

This demonstrates a neat trick where the sun and background are the same luminosity, so desaturating colours makes the sun disappear.

Now make it monochrome with the Black and White adjustment. The sun is now clearly still visible. So what is happening here that is different?

tone_contrast_monet_mono.jpg.3b004861b8fd0d27b068c02d9e7790da.jpg


Dave Straker

Cameras: Sony A7R2, RX100V

Computers: Win10: Chillblast Photo with i7-3770 + 16Gb RAM + Philips 40in 4K; Surface Pro 4 i5

Favourite word: Aha. For me and for others.

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