how to convert 227x227 image into 227x227x3

I am working on deep learning. try to use alexnet for training . but it takes 227x227x227 and i have 227x227.

[Walter Roberson]

Your title asks about 224 x 224 to 224 x 224 x 3, but your text asks for 227 x 227 to 227 x 227 x 227 ?

The methods we would use would be different for the two.

[manoj sain]

its updated now sir

Answer 1

[yanqi liu]

yes，sir，may be use

% convert 227x227 image into 227x227x3
imds = imageDatastore('imagefolder','IncludeSubfolders',true,'LabelSource','foldernames');
auimds = augmentedImageDatastore(imds,'ColorPreprocessing','gray2rgb')

% or

trainingImages = imageDatastore('imagefolder',...
    'IncludeSubfolders',true,...
    'LabelSource','foldernames','ReadFcn',@data_preporcess);

function data = data_preporcess(file)
data = imread(file);
if ndims(data) == 2
    data = cat(3, data, data, data);
end
data = double(data);
end

Answer 2

[Walter Roberson]

https://www.mathworks.com/help/deeplearning/ref/augmentedimagedatastore.html

with 'ColorPreprocessing', 'gray2rgb'