How can I change a pixel image from black and white to red & blue

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Yik lok  Chan
Yik lok Chan 2021 年 11 月 19 日
コメント済み: yanqi liu 2021 年 12 月 1 日
How can I change a pixel image from black and white to red & blue? The image present a letter 'H' with black and white but I want to change the colour into red & blue. ( testmap is my martix name)
0.2143 0.3395 0.4173 0.3642 0.4025 0.5045
0.4403 1.0000 0.2445 0.2729 1.0000 0.4498
0.4804 1.0000 0.2292 0.2102 1.0000 0.4223
0.3724 1.0000 1.0000 1.0000 1.0000 0.3090
0.4783 1.0000 0.5504 0.3024 0.5916 0.3535
0.5192 1.0000 0.2271 0.3599 1.0000 0.4186
0.3193 0.2616 0.4490 0.2360 0.3270 0.5178
imshow(testmap(:,:,1), 'InitialMagnification' ,2000);

回答 (1 件)

Robert U
Robert U 2021 年 11 月 19 日
Hi Yik lok Chan,
one way to do so is to utilize colormap()-command:
corn_gray = imread('corn.tif',3);
imshow(corn_gray)
map = [linspace(1,0,256)', zeros(256,1), linspace(0,1,256)'];
figure;
imshow(corn_gray,'Colormap',map)
Kind regards,
Robert
  1 件のコメント
yanqi liu
yanqi liu 2021 年 12 月 1 日
yes,sir,use Robert U method,can get
clc; clear all; close all;
testmap=[0.2143 0.3395 0.4173 0.3642 0.4025 0.5045
0.4403 1.0000 0.2445 0.2729 1.0000 0.4498
0.4804 1.0000 0.2292 0.2102 1.0000 0.4223
0.3724 1.0000 1.0000 1.0000 1.0000 0.3090
0.4783 1.0000 0.5504 0.3024 0.5916 0.3535
0.5192 1.0000 0.2271 0.3599 1.0000 0.4186
0.3193 0.2616 0.4490 0.2360 0.3270 0.5178];
imagesc(testmap(:,:,1));
% red & blue
map=[linspace(1,0,256)', zeros(256,1), linspace(0,1,256)'];
colormap(map); axis equal; axis off;

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