Image Colour Transfer is a free, browser-based application that allows a photo to be colour graded to match the colour of another photo, similar to the “Match Colour” feature found in some commercial photo editing applications.

The following Medium article gives an overview of the processing method and its applications. https://medium.com/@terence.johnson/a-free-touse-web-app-for-image-colour-transfer-processing-9f5b06c760f4

An independent (but highly favourable) review of the web app can be found here. https://petapixel.com/2022/01/12/this-web-app-can-use-one-photos-colors-to-grade-another/

The processing method is an enhancement of the colour transfer method proposed by E Reinhard et al. Facilities are provided to allow comparison between the enhanced and the original methods.

Technical details of the enhanced processing method are provided here. https://github.com/TJCoding/Enhanced-Image-Colour-Transfer-2/blob/main/Documents/Further%20Enhanced%20Image-Colour-Transfer.pdf

The Web App has been designed to primarily operate on a desktop or laptop computer, the speed and practicality of processing will depend upon image size and the computing power of a particular device.

A popular online version could be played here.