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The Incredible Math Behind the “Divide” Blend Mode! – Photoshop Tutorial

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Why Does the “Divide” Blend Mode Exist? Let’s take a deeper look at a magical application of the Divide blending mode to easily remove any color cast, and then, discover the amazing mathematics of how this blend mode works.

In this Photoshop tutorial, we will develop a deeper understanding of how the divide blend mode makes the colors interact and how the mathematical formula applies to the RGB values of the resulting color.

I hope this video helps you. Thank you so much for watching 🙂

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31 responses to “The Incredible Math Behind the “Divide” Blend Mode! – Photoshop Tutorial”

  5. This would be a great technique to use with filters with a known color cast, such as many ND filters. It would be an easy job to take a blank photograph using the filter and a white light source. The resulting image could then be used as the divisor default color for every shot taken using that filter; only needing possible adjustment of the brightness.

  6. Does anyone know how to do this in Adobe After Effects? I'm not sure how to do this. I'm creating a new solid layer over my footage and then selecting the color picker on something that should be white in my footage and changing the blend mode to divide but doesn't change anything. Any help would be appreciated.

  8. Just great ! First time I have the opportunity to dig a little bit into the arithmetics (or algebra ?) behind color transformations. Is there some place where we
    could get more info about the other « non trivial » blend modes ? And can we dream of some way of trying out other mathematical transformations ? I love it when we can put our own magic into our computers by experimenting with their internal fundamentals : it makes their magic ours – which is where it was in the first place … thanks a lot !

  13. The video is brilliant but it is not working for me, probably my fault.
    I did not have an image with a colour cast so I used a good image and applied a magenta cast to it with the colour balance option in the latest version of photoshop.
    Following your instructions numerous time I always got the same result. The magenta cast was reduced but was was still more magenta than the original tiff. Any ideas?

  22. Absolutely great work Unmesh, as usually..! Thank you very much for sharing! I have by chance worked and being also passionated about Digital Image Processing I have read a couple of books about..A lot of math and also high level math involved in blending modes as well..I have also had a look on Robert Thomas : PhotoBlogStop where he is also getting in depth with blending modes, so a minimum experience I have..Awesome tutorial, uniq channel you have and a big ❤ for your work, hard work..I must say! Thank you very much for sharing! ❤ You are the best! ❤
    Speaking of using divide blend mode for different techniques..I have tried to use it for color changing in compositing, together with masks and of course other adjustment layers..including of course clipped curves! 😀 Thank you again very very much..for all you do for us in here!

  28. One application of Divide could be refining masks. Let's say you've got a portrait and the model has dark hair with a dark background. You want the hair to pop, so you duplicate the layer, select the hair, create a mask, and then use divide to see how clean the mask is. Because it's the same image top and bottom, the unmasked area will be white.

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