how to set colorbar not showing values

Question

nirit 2016-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/307846-how-to-set-colorbar-not-showing-values

回答： Walter Roberson 2016-10-18

I have grayscale image with values 0, 11-max(image). I want to show 0 as black , and 11-max(image) as different type of red.

my questions are:

1.how to change the colorbar accordingly? I dont mind showing 0-11 as black, but it will be best if the values 1-10 will not shown at all at the colorbar. or , in other words, can I show at the colorbar only the values :0,11-end?

2. how to make the quantization of the red seem good? (so that the human eye could make the different between the shades )

please help?

thank you.

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Answer 1

Walter Roberson 2016-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/307846-how-to-set-colorbar-not-showing-values#answer_239542

You cannot use colorbar and have a range omitted. You could create your own colorbar replacement.

For the quantization you probably cannot do better than linspace() of the red values between some minimum and maximum in the 0 to 1 range,with number of steps equal to the greatest max value minus 9