Custom colors or color scales in heatmap

KNIME Analytics Platform
1

Dear Forum,

I’m using the JFreeChart Heatmap node a lot, but I’m struggling to make the following:

  1. a 3-color color scales as it is possible in e.g. excel, e.g. from green → yellow → red.
  2. Custom colors of text or numbers as in conditional formatting in excel, e.g. “Tomato” → red, “Cucumber” → green, “others” → purple etc.

Could anyone point me into the right direction on these topics, please? Would be highly appreciated.
Best,
Lars

2

Have you tried the Javascript-based Heatmap node instead? It allows you to set colors on its View Configuration tab.

1 Like
3

Hi Scott,

Thanks, yes, I have also tried the Heatmap node. I’d like to have the output as colors only, but I can’t seem to remove the row-ID and other labels. Do you know if there is way to control that? Can’t seem to find that option…

4

I don’t believe the feature you mention is currently supported - apologies for that.

5

Thanks again, ScottF. Then I guess it was not because I could not find that option.
Think it could be solved for my application by exporting the heatmap as image and cropping a number of pixels from left and top. Any hints in how to do that?

6

The Image Writer (Port) node could be used to export the heatmap you generated. After some additional manipulation, I believe you could then use the Image Cropper to tweak the image further, but I must confess to not being that experienced with the Image Processing extension.

Does that help?

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