The digital image should be 20 x 20 pixels in size and a complete white object against a black background.
MATLAB: Generate a two-dimensional square and rectangular shape digital image.
Image Processing Toolboxtwo-dimensional square
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I'm puzzeled by your first portion and the need for a for loop. unless you have a hold somewhere the images shouldn't be stacking and you're only doing it per item in physical_time_eleastic so you're imaging a single index at a time but without hold.... i'm not sure what is going on there.
outputdir='Figures';u1=figure(1)for i=1:length(physical_time_elastic) image(spatial_grid.*(10^6),physical_time_elastic(i).*(10^(12)),data_set_elastic(:,2,i))endcolormap jet;in each loop you are imaging a 1x30001 image and overwriting it. as well as axes are not set correctly as your x and y do not match column row of data_set_elastic. so something else is going on there.
why don't you image the whole 2nd dimension?
here is dummy data
spatial_grid = [0:300]';physical_time_elastic = [0:10:1000]';data_set_elastic = 2*rand(301,3,101)-1;u1=figure(1)% hold on
% for i=1:length(physical_time_elastic)
% image(spatial_grid.*(10^6),physical_time_elastic(i).*(10^(12)),data_set_elastic(:,2,i))
% end
imagesc(spatial_grid,physical_time_elastic,squeeze(data_set_elastic(:,2,:))');colormap jet; colorbarnote squeezing data_set_elastic(:,2,:) which for you is (30001 x 1 x 2431 elements) would turn out to be (30001 x 2431 elements) which then doesn't match your 30001 for x (ie columns of the image) and 2431 for y. which is why there is a transpose of squeezing data_set_elastic(:,2,:)' .
also i'm not sure image deals with negative values which you should then use imagesc or other functions which you define the color scale.
Try this:
s = load('img.mat')rgbImage = s.img;subplot(1, 2, 1);imshow(rgbImage)impixelinfotitle('Original Image', 'FontSize', 20);% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);greenChannel = rgbImage(:, :, 2);blueChannel = rgbImage(:, :, 3);blackMask = redChannel == 0 & greenChannel == 0 & blueChannel == 0;redChannel(blackMask) = 255;greenChannel(blackMask) = 0;blueChannel(blackMask) = 0;% Recombine separate color channels into a single, true color RGB image.
rgbImage = cat(3, redChannel, greenChannel, blueChannel);subplot(1, 2, 2);imshow(rgbImage);title('Now with black made red', 'FontSize', 20);
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