Issues with greyscale png images in matlab

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Caroline Harbison 2021-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/1566426-issues-with-greyscale-png-images-in-matlab

评论： Caroline Harbison 2021-10-18

I have a number of greyscale png images of faces (from a free dataset) that I am using as part of a Psychtoolbox experiment. In photo apps such as preview they all look okay, but when I open them in MATLAB several of them are pixelated and the colours are off so they are unusable (see attached photos). Any suggestions as to why this might be?

Thanks!

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Rik 2021-10-18

Can you attach the image as a file and post the code you used?

Caroline Harbison 2021-10-18

F1.png

myimage = imread('F1.png');

imshow(myimage)

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Dave B 2021-10-18

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编辑：Dave B 2021-10-18

在 MATLAB Online 中打开

This looks like the result of loading an indexed image, you can read the colormap using the second output of imread:

[img,cmap]=imread('image.png');
imshow(img,cmap)

Or you can convert it to an rgb image using ind2rgb:

img_rgb = ind2rgb(img,cmap);
imshow(img_rgb)

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Caroline Harbison 2021-10-18

That worked, thanks so much!

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MATLAB Graphics Images Convert Image Type

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R2020a

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