Could someone help me with the "imwrite" command please ? Error using imwrite>parse_inputs (line 541) The colormap should have three columns.

Question

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ImageData = imread(Result{1}(i).raw_list.z);
imwrite(ImageData , strcat("C:\Users\toto\Documents\SP4\Camera_Images\", num2str(i), '.png'), 'png');

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Answer 1

Guillaume 2018-7-20

3 个投票

The error message is misleading. The problem is that, surprisingly, imwrite does not yet support string arrays for the filename.

Change your double quotes to single quotes and all should be well

imwrite(ImageData , strcat('C:\Users\toto\Documents\SP4\Camera_Images\', num2str(i), '.png'), 'png');

Or rather than using strcat + num2str, use sprintf:

imwrite(ImageData , sprintf('C:\Users\toto\Documents\SP4\Camera_Images\%d.png', i), 'png');

giorgia calisti 2019-9-19

Great!! I was going mad with this error. Thank you for saving me quite some time of headbanging on the desk.

Guillaume 2019-9-19

Note that support for strings in imwrite was implemented in R2018b, so if you're using a recent version of matlab, this answer is no longer relevant.