How do I check if a value is a correct color?

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Ivan
Ivan 2014-7-16
回答： Paul Wintz 2021-8-20
Whether there is a function like
logical = isvalidcolor(value)
to check if some value may be used like a color (one of values specified in ColorSpec e.g.)

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Image Analyst
Image Analyst 2014-7-16
Not that I'm aware of - there's just not that much need - though you could write one if you want.
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Ivan
Ivan 2014-7-30
It's a good question! I havn't known about announcing an error by uicontrol or some else.
Image Analyst
Image Analyst 2014-7-30
You could do something like
message = sprintf('%s is an invalid color. Please use r, g, b, y, m, c, k, or w', theirColor);
uiwait(warndlg(message));
return;

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Tommy
Tommy 2015-12-6
编辑：Tommy 2015-12-6
Once I needed this function to suppress error messages, by setting wrong color values to MATLAB default. I used:
function logical_out = iscolor( color )
color = lower(color);
logical_out=(isnumeric(color) && (sum(size(color)==[1 3])==2 || ...
sum(size(color)==[3 1])==2) && sum((color<=[1 1 1] & ...
color>=[0 0 0]))==3) || sum(strcmpi({'y','m','c','r','g','b','w','k',...
'yellow','magenta','cyan','red','green','blue','white','black'},color))>0;
end
Hope this helps.
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Grzegorz Lippe
Grzegorz Lippe 2021-4-26
Well that helps until that point somebody specifies the color as hexadecimal value or integer from 0 ...255. Hope mathworks creates a validate color function :/

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Paul Wintz
Paul Wintz 2021-8-20
In Matlab 2020b and later, use the validatecolor function.

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