Save a plot to a graphics format file

Question

Julián Francisco 2011-11-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/21370-save-a-plot-to-a-graphics-format-file

评论： Image Analyst 2018-3-25

I am designed the following GUI where there are an axes. I want to save the plot drawn inside them to a graphics format file. However, the file obtained is an image of the overall figure window. This is my code:

X = 0:pi/100:2*pi;
Y = sin(X);
fh = figure;
Pan1 = uipanel(fh,'Units','normalized','Position',[0 0 0.5 1],'title',...
    'Panel1');
Pan2 = uipanel(fh,'Units','normalized','Position',[0.5 0 0.5 1],'title',...
    'Panel2');
haxes = axes('Parent',Pan2,'Units', 'normalized','Position',...
    [0.25 0.25 0.5 0.5]);
hplot = plot(haxes,X,Y);
FileName = uiputfile('*.bmp;*.png;*.jpg;*.tif','Save as');
saveas(hplot,FileName);

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Anil Kumar 2018-3-25

Thank you norhan Mohamed..I could solve my issue with your code

Image Analyst 2018-3-25

在 MATLAB Online 中打开

I should have warned of this earlier. Beware of using norhan's code. It only works if there is no scaling/zooming/fitting of the image to the axes. To illustrate that, just run this code:

rgbImage = imread('C:\Program Files\MATLAB\R2018a\toolbox\images\imdata\concordaerial.png');
imshow(rgbImage);
size(rgbImage)
A = getframe(gca)

You'll see

Warning: Image is too big to fit on screen; displaying at 33% 
> In images.internal.initSize (line 71)
  In imshow (line 336)
  In test5 (line 10) 
ans =
        2036        3060           3
A = 
  struct with fields:
         cdata: [679×1020×3 uint8]
      colormap: []

Note how the size goes from 2036x3060 to 679x1020?

So A.cdata is not the same size as the original image!

It is the displayed size.

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Answer 1

Image Analyst 2011-11-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/21370-save-a-plot-to-a-graphics-format-file#answer_28224

Ah yes, finally our daily "how do I save a figure?" question. Please refer to the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_save_my_figure.2C_axes.2C_or_image.3F_I.27m_having_trouble_with_the_built_in_MATLAB_functions. where you'll see reference to the most downloaded File Exchange submission, export_fig(). Just use that and simplify your life. Braving it alone with low level MATLAB code is not for the faint of heart or novices, and often causes problems as you now have seen.