Azzera filtri
Azzera filtri

Plotting Grayscale from .csv with colorbar restriction

2 visualizzazioni (ultimi 30 giorni)
Hi there,
Can anyone please help..? I have grayscale image data in a .csv file I need to plot. The values in the .csv are the z values that I wish to plot as an image, the x and y coordinates of the z values in the file represent the location of that pixel in the image.
I need to restrict the colorbar to say 0 to 0.5 to see the detail in the certain part of the image. Everything below 0 can be black, above 0.5 can be white, but I need 0-0.5 to be greyscale.
I have plotted using the following code but what I get is a mostly blank image.
Please can someone help? I attach the data and my plot.
filename = 'C:\\my data.csv';
M = csvread(filename)
J = contourf(M)
colormap gray
h = colorbar;
set(h, 'ylim', [0 0.5])

Risposta accettata

Jaslyn Tan
Jaslyn Tan il 12 Nov 2019
In the end I used this:
filename = 'C:\\my data.csv';
M = csvread(filename)
clims = [0 1];
J = imagesc(M,clims)
colormap('jet')
Thank you so much for your help!

Più risposte (1)

Walter Roberson
Walter Roberson il 24 Ott 2019
caxis([0 0.5])
  1 Commento
Jaslyn Tan
Jaslyn Tan il 27 Ott 2019
Thank you so much! But
filename = 'C:\\my data.csv';
M = csvread(filename)
J = contourf(M)
colormap gray
caxis([0 0.5])
only changes the scale bar, the image is still all black. Am I doing this wrong..? Thank you in advance.

Accedi per commentare.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by