Display a small matrix as a gray scale image

I have a small text file called "my_img_data.txt".

I want to display it as a grey scale image.

I am using

>>T1 = load('my_img_data.txt')

T1 =

120 250 214 82

250 214 82 120

214 82 120 250

250 214 82 120

T2 = T2 = mat2gray(T1,[0 255])

>>T2 =

0.4706 0.9804 0.8392 0.3216

0.9804 0.8392 0.3216 0.4706

0.8392 0.3216 0.4706 0.9804

0.9804 0.8392 0.3216 0.4706

>> imshow(T2)

It displays an image in gray scale, but only as 4x4 pixels out of something like 256x256, so I can hardly see it. How can I make it so it shows just the 4x4 pixels?

By the way, if I use image(T1), I get just the 4x4 pixels, but it's a color map. I want grey scale.

Thank you,

Maarten

Answer 1

[Matt J]

T2 =[
    0.4706    0.9804    0.8392    0.3216
    0.9804    0.8392    0.3216    0.4706
    0.8392    0.3216    0.4706    0.9804
    0.9804    0.8392    0.3216    0.4706];


imagesc(T2); colormap(gray(256)); colorbar

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[Walter Roberson]

T2 =[
    0.4706    0.9804    0.8392    0.3216
    0.9804    0.8392    0.3216    0.4706
    0.8392    0.3216    0.4706    0.9804
    0.9804    0.8392    0.3216    0.4706];


image(T2, 'CDataMapping', 'scaled'); colormap(gray(256)); colorbar

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[Maarten]

Works! Thank you! Maarten

[Matt J]

You're welcome, but please Accept-click the answer to indicate that it worked.

Answer 2

[Image Analyst]

Try using the 'InitialMagnification' option in imshow

T2 =[
    0.4706    0.9804    0.8392    0.3216
    0.9804    0.8392    0.3216    0.4706
    0.8392    0.3216    0.4706    0.9804
    0.9804    0.8392    0.3216    0.4706];
imshow(T2, 'InitialMagnification', 10000); % Adjust number as needed.

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