I would like to plot a scatter plot over a background image. But the origin of the image is at the top left corner. I need the bottom left of the image to be the origin so the bottom left = (0, 0.75) and top right (14, 1.25)
So I need to scale the image to my data from pH 0 - 14 (This is the x axis) and Eh 0.75 - 1.25 (This is the y axis)
Eh = [327.06 561.34 506.82 602.58 745.02 745.04 ...
693.96 682.9 648.46 468 412.18 522.94 459.74]./1e3; % V
pH = [6.4 4.51 5.08 4.98 3.63 4.31 6.24 6.22 4.94 6.44 7.05 5.09 4.63]; %pH
I=imread('Fe_Pourbaix.png');
xImg = linspace(0, 14, size(I, 2));
yImg = linspace(-0.75, 1.25, size(I, 1));
image(xImg, yImg, I, 'CDataMapping', 'scale');
hold on;
plot(pH, Eh,'*','LineWidth',2);
grid on;
Suppose I Need to flip the data? The below image is what I need is the x and y I need to produce to overlay my data
