which colormap I can chose to draw these figures?
3 次查看(过去 30 天)
显示 更早的评论
采纳的回答
DGM
2024-2-8
编辑:DGM
2024-2-8
Attached are colormap generators that attempts to make something close to the given colormaps. It's only a blind approximation, but it's closer. The three images don't use the same colormap, so here are three different versions. Pick one.
load SNR.mat
% the first map is a 5-point map with dark endpoints and a white center
imagesc(Snear)
colormap(bluewhitered1(256))
% the second map is a 3-point map with bright endpoints and a white center
figure
imagesc(Snear)
colormap(bluewhitered2(256))
% the third map is a 5-point map with slightly dark endpoints and a gray center
figure
imagesc(Snear)
colormap(bluewhitered3(256))
Bear in mind that there isn't a way to back-calculate the colormap from the image alone. The progression is all guesswork, and the rest is just PWL interpolation in RGB based on those guesses and a sampling of the provided colors.
更多回答(1 个)
Image Analyst
2024-2-7
Hard to say without knowing the data values but it looks like a ramp of red and an inverse ramp of blue with white in the middle. Maybe try something like
numColors = 256;
triangle = [linspace(0, 1, numColors/2)'; linspace(1, 0, numColors/2)'];
r = triangle;
g = triangle;
b = triangle;
r(numColors/2 + 1 : end) = 1;
b(1 : numColors/2) = 1;
plot(r, 'r-', 'LineWidth', 3);
hold on;
plot(g, 'g-', 'LineWidth', 3);
plot(b, 'b-', 'LineWidth', 3);
title("Custom Color Map")
grid on;
% Make the colormap
cmap = [r, g, b];
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Blue 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!