Get the path of image when changed

[surahmans]

I have read this document http://octobercms.com/docs/backend/forms#field-dependencies.

I need to change the 'color' field when the 'photo' field has changed. How to implement this?

I have tried many and many but still cannot resolve this case.

FYI, I want to get the dominant color of the image using color thief package. It's doesn't matter and work on front end. But I can't do that on backend.

Thank you,

[daftspunk]

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[daftspunk]

You need the color field to depend on the photo field.