Tôi muốn thêm màu vào các huyền thoại theo giá trị rgb của màu tương ứng trong ảnh. Hình ảnh có thể được hiển thị bằng mã được viết dưới đây:
x1=ones(30); x2=2*ones(30); x3=3*ones(30);
x=[x1,x2,x3];
y1=zeros(30,90); y2=zeros(30,90); y3=zeros(30,90); y=zeros(30,90,3);
y1(x==1)=0; y2(x==1)=77; y3(x==1)=26;
y1(x==2)=102; y2(x==2)=255; y3(x==2)=102;
y1(x==3)=204; y2(x==3)=102; y3(x==3)=0;
y(:,:,1)=y1; y(:,:,2)=y2; y(:,:,3)=y3;
imshow(uint8(y))
Câu trả lời:
Có hai cách chính, cách thứ nhất và dễ nhất là sử dụng thanh màu
%insert after you open the figure
myc=[0 77 6; 102 255 102;204 102 0]./255; %create your colormap, I just quickly copied the rgb values by hand but there are more elegant ways of cours
colormap(myc); %set the colormap
hcb=colorbar; %call a colorbar as legend
%%% if you want to turn off the ticks add the code below
hcb.Ticks=[];
Nếu bạn muốn sử dụng các mục cụ thể cho từng màu, bạn có thể sử dụng mục này
clear all; % just for ease of quickly plotting this
close all; %closing all figures
myc=[0 77 6; 102 255 102;204 102 0]./255; %this is can be used to draw the paralel lines, can be of any color, just replace the zeros, with the respective values of the colors you want, 0 0 0 is black
x = [0 0 0 0]; %making it have 0 area and thus invisible
y = [0 0 0 0];
figure
hold on
text=cell(1,length(myc)); %make an empty cell array for the strings of the legend
for i=1:length(myc) %run a for loop for each color in your color array
h(i)=patch(x,y,myc(i,:),'EdgeColor','none'); %For a rectangular color entry in legend, set the color to the corresponding value of the array
text{1,i}=['color ', num2str(i)]; %create a text to go with the color
end
[lgd,OBJH,OUTH,OUTM]=legend([h],text); %the lgd handle let's you later modify properties of the legend
xlim([0 1])
ylim([0 1])
Dưới đây là một đoạn mã mẫu mực khác, nơi tôi chỉ cho bạn cách tùy chỉnh một huyền thoại nói chung nếu bạn muốn những thứ cụ thể hơn.
clear all; % just for ease of quickly plotting this
close all; %closing all figures
myc=[1 1 1; 0 0 0; 1 1 1; 0 0 0; 1 1 1]; %this is can be used to draw the paralel lines, can be of any color, just replace the zeros, with the respective values of the colors you want, 0 0 0 is black
x = [0 0 0 0]; %making it have 0 area and thus invisible
y = [0 0 0 0];
c = [0 0.33 0.66 1]; %lets you add a colorbar
figure
colormap(myc); %update the figure to use your colormap
hold on
h1=patch(x,y,'Color','red','EdgeColor','none'); %For a rectangular color entry in legend, red can be replaced by an RGB value on a 0 to 1 interval
h3 = plot(NaN,NaN,'Color','none'); %blank entry
h2=patch(x,y,c,'EdgeColor','none'); %lets you add the colorbar, later use to place inside the legend as paralel lines
h4 = plot(NaN,NaN,':'); % entry with dotted line, color "pseudo random"
[lgd,OBJH,OUTH,OUTM]=legend([h1,h3,h2,h4],{'HI your text here','Nothing','paralel lines','line'}); %the lgd handle let's you later modify properties of the legend
hcb=colorbar; %the colorbar can still be modified, to have no number or a different scale, color, etc.
hcm=OBJH(5)
xlim([0 1])
ylim([0 1])
lpos=lgd.Position; % get position legend
lnr=numel(OUTH); %legend entries is useful
lhstp=lpos(4)/(lnr+1); %heigth step
hax=gca;
axpos=hax.Position; %to shift position because the colorbar is placed in the figure and not within the axes in comparison to the legend
% placing at by example 3rd entry
wdentry=0.04; %at the moment trial and error depends on width on legend box which is based on amount of characters and text size.
p1=axpos(1)+lpos(1)+0.01;
p2=lpos(2)+3/2*lhstp;
p3=wdentry;
p4=lhstp-0.01;
hcb.TickLabels=[]; %remove tick labels
hcb.Ticks=[]; %remove ticks
hcb.Color=[1 1 1]; %white border around it to make it "semi-invisible"
hcb.Position=[p1 p2 p3 p4];