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freezeColors / unfreezeColors

version 1.3.0.0 (146 KB) by John Iversen
Use multiple colormaps per figure! Version 2, now works for many types of objects, not only images.

46.3K Downloads

Updated 16 Jan 2017

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Editor's Note: This file was selected as MATLAB Central Pick of the Week

Update: 2017: As of Matlab 2014b, this may no longer be needed as MATLAB now allows multiple colormaps per figure--please see my comment. Thanks!
Version 2.3, 3/2007
(*What's NEW: 9/2010, A colorbar solution)

Problem: There is only one colormap per figure, so all plots share the same colormap. Often one wants different colormaps.

Solution: This function pair provides an easy way to have plots using different colomaps in the same figure.

Example:
subplot(2,1,1)
imagesc(peaks)
colormap hot
freezeColors %freeze this plot's colormap

subplot(2,1,2)
colormap hsv % won't change any frozen plots!
surf(peaks)
freezeColors
etc...

**** COLORBAR WORKAROUND (NEW 9/2010) ****
** Note: in recent versions of MATLAB the colorbar is reinitialized
** whenever you call COLORMAP, which undoes the effects of freezeColors.
**
** Suggested solution: Use the function CBFREEZE, by
** Carlos Adrian Vargas Aguilera, located in the fileexchange
** http://www.mathworks.com/matlabcentral/fileexchange/24371

%usage
h=colorbar; cbfreeze(h), or simply cbfreeze(colorbar)

%Colorbar workaround example
imagesc(peaks)
freezeColors
cbfreeze(colorbar)

Since Carlos has made a nice solution, I have chosen not to duplicate his efforts. Please use his fine code.
****

FUNCTIONS

freezeColors Freeze colors of plots, making them immune to later changes in the colormap. Converts colors of many graphics objects (images, surfaces, scattergroups, bar plots, patches, etc--anything using indexed CData) to [r g b] truecolor.

unfreezeColors Reverses the effects of freezeColors. Restores the original indexed color data, allowing the colormap and caxis to again affect the plots.

Demo & Documentation in freezeColors_pub.html, test in test/test_main.m.

Cite As

John Iversen (2021). freezeColors / unfreezeColors (https://www.mathworks.com/matlabcentral/fileexchange/7943-freezecolors-unfreezecolors), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2010a
Compatible with any release
Platform Compatibility
Windows macOS Linux

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