How do I correct my colors in my indexed image displayed with image() function?
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
For this problem I needed to code an image that contains five different colors placed in different places in a 40 x 40. My code gets the image to print, but the colors are wrong. There are different colors, but they are all variations of purple. I am not sure what I am doing wrong and what I need to do to fix it. I tried retyping the code and redoing the figure, but it didn't help. I also tried to look up several solutions and nothing I came across helped. I tried with variable names, numbers, colormap, no colormap, and I am not sure how to fix it. Help would be greatly appreciated. Thank you in advance!
Guidelines:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1198783/image.jpeg)
My Figure:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1198788/image.jpeg)
My Code:
teal = [0.08,0.25,0.3];
black = [0,0,0];
red = [1,0,0];
darkred = [0.24,0.008,0.008];
% 1 == teal;
% 2 == black;
% 3 == red;
% 4 == darkred;
% myColors = [teal; black; red; darkred];
%
% colormap(myColors)
pixelPicture = ones(40,40);
pixelPicture(1:10,1:5) = 1;
pixelPicture(11:20,1:5) = 4;
pixelPicture(21:40,1:5) = 1;
pixelPicture(1:5,6:10) = 4;
pixelPicture(6:40,6:10) = 1;
pixelPicture(1:5,11:15) = 1;
pixelPicture(6:10,11:15) = 4;
pixelPicture(11:15,11:15) = 1;
pixelPicture(16:20,11:15) = 3;
pixelPicture(21:25,11:15) = 4;
pixelPicture(26:30,11:15) = 1;
pixelPicture(31:40,11:15) = 2;
pixelPicture(1:15,16:20) = 1;
pixelPicture(16:25,16:20) = 3;
pixelPicture(26:40,16:20) = 1;
pixelPicture(1:15,21:25) = 1;
pixelPicture(16:20,21:25) = 3;
pixelPicture(21:25,21:25) = 4;
pixelPicture(26:40,21:25) = 1;
pixelPicture(1:5,26:30) = 1;
pixelPicture(6:10,26:30) = 4;
pixelPicture(11:15,26:30) = 1;
pixelPicture(16:25,26:30) = 4;
pixelPicture(26:30,26:30) = 1;
pixelPicture(31:40,26:30) = 2;
pixelPicture(1:5,31:35) = 4;
pixelPicture(6:40,31:35) = 1;
pixelPicture(1:10,36:40) = 1;
pixelPicture(11:15,36:40) = 3;
pixelPicture(16:20,36:40) = 4;
pixelPicture(21:40,36:40) = 1;
figure(2);
image(pixelPicture)
0 Kommentare
Akzeptierte Antwort
Image Analyst
am 18 Nov. 2022
You aren't calling colormap function - it's commented out and was appearing before you displayed anything. This works fine:
teal = [0.08,0.25,0.3];
black = [0,0,0];
red = [1,0,0];
darkred = [0.24,0.008,0.008];
% 1 == teal;
% 2 == black;
% 3 == red;
% 4 == darkred;
pixelPicture = ones(40,40);
pixelPicture(1:10,1:5) = 1;
pixelPicture(11:20,1:5) = 4;
pixelPicture(21:40,1:5) = 1;
pixelPicture(1:5,6:10) = 4;
pixelPicture(6:40,6:10) = 1;
pixelPicture(1:5,11:15) = 1;
pixelPicture(6:10,11:15) = 4;
pixelPicture(11:15,11:15) = 1;
pixelPicture(16:20,11:15) = 3;
pixelPicture(21:25,11:15) = 4;
pixelPicture(26:30,11:15) = 1;
pixelPicture(31:40,11:15) = 2;
pixelPicture(1:15,16:20) = 1;
pixelPicture(16:25,16:20) = 3;
pixelPicture(26:40,16:20) = 1;
pixelPicture(1:15,21:25) = 1;
pixelPicture(16:20,21:25) = 3;
pixelPicture(21:25,21:25) = 4;
pixelPicture(26:40,21:25) = 1;
pixelPicture(1:5,26:30) = 1;
pixelPicture(6:10,26:30) = 4;
pixelPicture(11:15,26:30) = 1;
pixelPicture(16:25,26:30) = 4;
pixelPicture(26:30,26:30) = 1;
pixelPicture(31:40,26:30) = 2;
pixelPicture(1:5,31:35) = 4;
pixelPicture(6:40,31:35) = 1;
pixelPicture(1:10,36:40) = 1;
pixelPicture(11:15,36:40) = 3;
pixelPicture(16:20,36:40) = 4;
pixelPicture(21:40,36:40) = 1;
figure(2);
image(pixelPicture)
impixelinfo
myColors = [teal; black; red; darkred];
colormap(myColors)
colorbar
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Red finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!