MATLAB code error...

Hello

I'm running a Matlab code related to quantifying the sphericity of soil particles.

Now I'm using MATLAB R2022a version

please check for errors

This code was made in 2016.

Thanks

[Image Analyst]

Can you attach the tif file so I can determine why it has 4 planes? Aso attach your m-file so I can try it. Is it supposed to be an RGB true color image, or a volumetric image? Or an RGB image with an alpha channel? If it's a volumetric image, you should use bwlabeln instead of bwlabel.

Answer 1

[Walter Roberson]

imbinarize() treats 3D arrays as being volumes. imbinarize() is not suitable for converting RGB images to binary.

To convert RGB images to binary, you should first use im2gray (R2020a or later), or rgb2gray

Note that TIFF images with 4 panes can be either RGBA or CMYK. To read RGBA images you should be using something like

[img, map, alpha] = imread('filename.tif');

If img comes out with three panes and map is empty and alpha is non-empty, then the file was RGBA.

If img comes out with four panes and map is empty and alpha is empty, then the file was CMYK.

There is another possibility: if the TIFF file is RGBIr (RBG plus infrared), then sometimes it will be written (incorrectly) as RGBA. RGBIr TIFF images should instead be constructed as RGB plus a seperate data pane (that will not be read by imread())