您正在关注此问题

您将在关注的内容源中看到更新。
您可能会收到电子邮件，具体取决于您的通信预设项。

Saving a plot as png 2242243 image

4 次查看（过去 30 天）

显示更早的评论

ali 2021-2-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image

⋮

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image

评论： ali 2021-6-24

Hi,

I have generated a plot in Matlab as shown in figure.When i save it using 'saveas(gcf,'im1.png')' , it is saved as a 656*875*3 png image.I want to save it as 224*224*3 png image without the axis titles,labelling and colorbar.i.e.only the actual plot.Can anyone kindly guide on it?

guide about

Thanks

2 个评论
显示无隐藏无

KALYAN ACHARJYA 2021-2-17

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1334507

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1334507

编辑：KALYAN ACHARJYA 2021-2-17

Can you share plot details?

ali 2021-2-18

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1337167

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1337167

Its a spectrogram with frequency on y axis and time on x axis

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Rik 2021-2-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#answer_625577

⋮

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#answer_625577

You can do three things:

Don't create your image as a plot, but as an image.
Crop the image down to the location of your axes object.
Use export_fig.

14 个评论
显示 12更早的评论隐藏 12更早的评论

ali 2021-2-18

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1337172

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1337172

Can you kindly guide further about option 1?

Rik 2021-2-18

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1337252

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1337252

That depends on how you created this plot. You can probably round your data to integer and use ind2rgb to convert to an RGB image. If you attach example data and your code, we might be able to give an explicit example.

ali 2021-2-20

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1341814

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1341814

在 MATLAB Online 中打开

load('data.mat');
x = sum(AA/max(max(abs(AA)))); %normalizing bw 0 and 1 and summing across rows
a=size(x);
for k=4960:4960:a(2)
x1=x(k-4959:k);
figure();
c=jet(256);colormap(c);
spectrogram(x1,hanning(512),487,1024,12.4e3,'centered','yaxis','MinThreshold',-60);
end

Rik 2021-2-20

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1341924

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1341924

Your data is not attached and if hanning is a function, it no longer exists (although there is a hann function).

I don't have the signal processing toolbox, so I will need to expirement with the Run feature in this forum.

ali 2021-2-23

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1348214

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1348214

I am unable to attach data as max limit is 5MB for attachments.

Rik 2021-2-23

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1348269

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1348269

Can you reduce the size of the variables? Is all data really necessary? The image will look differently, but I should still be able to reproduce a similar image.

ali 2021-3-8

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1375811

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1375811

data.mat

Hi,

Attached is the data..loop will not be necessary as data is less now.

Rik 2021-3-8

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1375951

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1375951

What code should I be using?

ali 2021-3-22

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1409957

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1409957

load('data.mat');

x = sum(AA/max(max(abs(AA)))); %normalizing bw 0 and 1 and summing across rows

a=size(x);

for k=4960:4960:a(2)

x1=x(k-4959:k);

figure();

c=jet(256);colormap(c);

spectrogram(x1,hanning(512),487,1024,12.4e3,'centered','yaxis','MinThreshold',-60);

end

Rik 2021-3-24

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1413823

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1413823

Your mat file contains the variable data, which is not even used by the code. How am I supposed to help you like this?

Check that your code doesn't use any variables appart from those in the mat file.

Put your mat file in a separate folder, call clearvars and then run your code. If it doesn't run for you, it will not run for me either.

And please use the S=load('data.mat') syntax. That will show you immediately where variables are coming from. If it isn't followed by AA=S.AA; I don't even have to download your mat file before telling you that you fix your example.

Also, use the formatting tools when posting.

ali 2021-6-16

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1585660

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1585660

在 MATLAB Online 中打开

Hi Rik,

Sorry for replying late. Actually, i uploaded the data file after modification(due to attachment size limitation) but forgot to change code accordingly. I have corrected the code as follow. Now it will work with the mat file. Make sure to put the mat file in the Matlab path.

load('data.mat');
x = sum(data/max(max(abs(data)))); %normalizing bw 0 and 1 and summing across rows
figure();
c=jet(256);colormap(c);
spectrogram(x,hanning(512),487,1024,12.4e3,'centered','yaxis','MinThreshold',-60);

Rik 2021-6-16

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1585730

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1585730

Please use the S=load('data.mat') syntax.

ali 2021-6-17

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1587925

⋮

链接

此评论的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747732-saving-a-plot-as-png-224-224-3-image#comment_1587925

在 MATLAB Online 中打开

S=load('data.mat');
x = sum(S.data/max(max(abs(S.data)))); %normalizing bw 0 and 1 and summing across rows
figure();
c=jet(256);colormap(c);
spectrogram(x,hanning(512),487,1024,12.4e3,'centered','yaxis','MinThreshold',-50);