Bilge opened a new issue #13399: URL: https://github.com/apache/incubator-echarts/issues/13399
### What problem does this feature solve? RGB interpolation suffers from colour desaturation when interpolating between two colours with disparate hues. There are [some articles](https://web.archive.org/web/20150215132805/https://www.stuartdenman.com/improved-color-blending/) about this issue and also some proposed solutions, such as [HSB and Lch blending algorithms](https://www.shadertoy.com/view/lsdGzN), which produce better results that **maintain saturation and brightness** during interpolation. #### Example of problem  In this example, eCharts interpolates between `#70b53c` and `#7c45a5`, but we see the mid point is actually almost entirely grey `#77717c`! <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE --> <!-- This issue is in English. DO NOT REMOVE --> ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
