Alternative to scatter plot
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I have a 3x100k matrix of scattered XYZ data over an an area that I wish to plot. So far I have been using scatter plot to visualize, but when I print the plot to .png it becomes 'blurry' like picture attached. Is there an alternative to the scatter plot take makes for a smoother image?
Thanks.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/997195/image.jpeg)
3 个评论
Jan
2022-5-13
@Christian Mathiesen: Please mention, what you call "blurry". We do not see, what you expect instead. What should be "smoother"?
How do you "print the plot"? The image contains the icon of the axes menu. Is this a screen shot?
回答(1 个)
Image Analyst
2022-5-14
Create an image of desired resolution and then assign every row to a point in the image. Then use imwrite(). Something like (untested because ou forgot to upload your x,y,z data):
minX = min(x);
maxX = max(x);
minY = min(y);
maxY = max(y);
aspectRatio = (maxY - minY) / (maxX - minX)
% Make an image with 1920 columns
columns = 1920;
rows = round(aspectRatio * 1920)
grayImage = zeros(rows, columns, 'uint8');
% Rescale x and y so they will be within the image dimensions.
xs = round(rescale(x, 1, columns));
ys = round(rescale(y, 1, rows));
zs = uint8(rescale(z, 0, 255)); % Convert z to gray levels in the range 0-255
% Assign pixels
for k = 1 : length(x)
grayImage(ys(k), xs(k)) = zs(k);
end
imshow(grayImage, []);
impixelinfo;
axis('on', 'image');
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