I'm trying to apply the Alexnet transfer learning example but it's not working with my dataset

Mohamed_amine_habch asked: 2021-07-01 alexnet , cnn , googlenet , deep learning , matlab

Struggling with AlexNet transfer learning on your dataset? Get expert help troubleshooting common issues and adapting the MATLAB example for your specific needs

Expert Answer

Prashant Kumar answered . 2025-07-30 08:27:38

imresize does not accept [227 227 3] as a parameter. You would have used imresize with [227 227] as a parameter. However, imresize does not change the number of color channels.

In short: some of your files are not RGB images. They are one of:

binary images (PNG) (TIFF)
grayscale images (GIF) (PNG) (TIFF) (JPG but quite rare)
pseudocolor images (GIF) (PNG) (TIFF)
CMYK images (TIFF)
RGBA images (TIFF) (possible with PNG even if not officially supported; PNG prefers RGB+A)

JPEG 2000 should also be in that table somewhere, but I do not remember exactly what it supports.

Possibly you have some JPEG that you are thinking are grayscale. Grayscale JPEG are very very uncommon: I have only encountered one in about 20 years that was not a test image to prove that it could be done. Nearly all JPEG images that appear to be grayscale are instead RGB images.

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