Is there a code to replace image toolbox function 'ind2gray'?

Question

Denni Purcell 2016-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/273735-is-there-a-code-to-replace-image-toolbox-function-ind2gray

回答： Walter Roberson 2016-3-16

I am using the 'ind2gray' function of the image processing toolbox and our licence is due to expire. Considering this is the only function of the tool box used I am wondering if there is a code to replace it?

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Answer 1

Walter Roberson 2016-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/273735-is-there-a-code-to-replace-image-toolbox-function-ind2gray#answer_213783

Use the formula shown in http://www.mathworks.com/matlabcentral/answers/159282-convert-from-rgb-to-grayscale-without-rgb2gray to convert your map into grayscale. Then use the indices to index that grayscale data. If the indices are floating point then use the indices directly; if the indices are uint8() or uint16() then double() and add 1 and index with that.