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 Contour Plot From Two Colormaps		  New Topic  Reply to Topic
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Sreis

USA
3 Posts
Posted - 03/08/2023 :  2:50:50 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Sorry if there is already a thread for this, but I cannot find one.

I am trying to make a contour plot where each pixel contains two values. One will be linked to a colormap (i.e. parula, so that high values will be yellow and low values blue). The second value will be related to the darkness of the pixel (i.e. 1 = pixel is black, 0 = pixel is the parula color, 0.5 = dark version of the parula color). Is there a way to make this contour plot in Origin?

Thanks for any help!

YimingChen

1651 Posts
Posted - 03/08/2023 :  3:27:21 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Origin doesn't have the option to map darkness to a matrix. However, if the data contains only three values for darkness, a possible workaround could be to split the matrix into three separate matrices and then create a contour plot for each matrix using a different color palette. Finally, the three matrices can be merged together to form the complete plot (Stack the three contour layers). Could you share some sample data? Thank you.

James
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Sreis

USA
3 Posts
Posted - 03/08/2023 :  5:55:34 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Yes, here are the two matrices. One should have values from -90 to 90. The other should be from 0 to 1. So, all of the 0's in the upperMatrix would be black and all the rest would be the parula colormap with varying darknesses.



https://my.originlab.com/ftp/forum_and_kbase/Images/ContourPlotafdafsdafdsa.opju

Thanks!
Edited by - Sreis on 03/08/2023 6:01:54 PM
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YimingChen

1651 Posts
Posted - 03/09/2023 :  09:40:14 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Could you make a black-white contour and uses it as a mask? Then merge the original contour plot and the mask contour plot (menu Graph->Merge Graph Windows). See the attached project file.

https://my.originlab.com/ftp/forum_and_kbase/Images/ContourPlotafdafsdafdsa1.opju
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