blocks|key|374868|text|首先，当使用T0+is+not+None时会发生什么？我会对此进行测试，然后调整传递给plt.subplot()的值；可能会尝试值131、132和133，或者使用依赖于T0是否存在的值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|374869|其次，在调用plt.show()之后，会创建一个新的图形。要处理此问题，您可以|374870|在调用plt.show()|374871|Save++figure之前先调用plt.savefig('tessstttyyy.png',+dpi=100)，然后通过调用plt.gcf()获取当前图形，然后可以随时对此Figure对象调用savefig()。|unordered-list-item|374872|374873|例如：|374874|fig1+=+plt.gcf()
plt.show()
plt.draw()
fig1.savefig('tessstttyyy.png',+dpi=100)|code-block|syntax|javascript|374875|在您的代码中，'tesssttyyy.png‘是空白的，因为它正在保存新的图形，而没有向其中绘制任何内容。|374876|entityMap^0|6|E|17|D|2C|2|0|6|A|0|3|A|0|H|13|1R|9|2F|6|2P|9|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|1B|8|@$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1L|8|@]|D|@]|E|$]]|$1|P|3|Q|5|R|7|1M|8|@]|D|@]|E|$S|T]]|$1|U|3|V|5|6|7|1N|8|@]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1O|8|@]|D|@]|E|$]]]|X|$]]

First, what happens when <code>T0 is not None</code>? I would test that, then I would adjust the values I pass to <code>plt.subplot()</code>; maybe try values 131, 132, and 133, or values that depend whether or not <code>T0</code> exists.

Second, after <code>plt.show()</code> is called, a new figure is created. To deal with this, you can

<ol>
<li>Call <code>plt.savefig('tessstttyyy.png', dpi=100)</code> before you call <code>plt.show()</code></li>
<li>Save the figure before you <code>show()</code> by calling <code>plt.gcf()</code> for "get current figure", then you can call <code>savefig()</code> on this <code>Figure</code> object at any time.</li>
</ol>

For example: 

<pre><code>fig1 = plt.gcf()
plt.show()
plt.draw()
fig1.savefig('tessstttyyy.png', dpi=100)
</code></pre>

In your code, 'tesssttyyy.png' is blank because it is saving the new figure, to which nothing has been plotted.

blocks|key|374903|text|plt.savefig()之后应该有plt.show()|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|374904|说明：plt.show()清除了整个事件，所以之后的任何事情都会发生在一个新的空数字上|374905|entityMap^0|0|D|I|A|0|3|A|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

<code>plt.show()</code> should come after <code>plt.savefig()</code>

Explanation: <code>plt.show()</code> clears the whole thing, so anything afterwards will happen on a new empty figure

blocks|key|4414060|text|让我举一个更详细的例子：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4414061|import+numpy+as+np
import+matplotlib.pyplot+as+plt


def+draw_result(lst_iter,+lst_loss,+lst_acc,+title):
++++plt.plot(lst_iter,+lst_loss,+'-b',+label='loss')
++++plt.plot(lst_iter,+lst_acc,+'-r',+label='accuracy')

++++plt.xlabel("n+iteration")
++++plt.legend(loc='upper+left')
++++plt.title(title)
++++plt.savefig(title%2B".png")++#+should+before+plt.show+method

++++plt.show()


def+test_draw():
++++lst_iter+=+range(100)
++++lst_loss+=+[0.01+*+i+%2B+0.01+*+i+**+2+for+i+in+xrange(100)]
++++#+lst_loss+=+np.random.randn(1,+100).reshape((100,+))
++++lst_acc+=+[0.01+*+i+-+0.01+*+i+**+2+for+i+in+xrange(100)]
++++#+lst_acc+=+np.random.randn(1,+100).reshape((100,+))
++++draw_result(lst_iter,+lst_loss,+lst_acc,+"sgd_method")


if+__name__+==+'__main__':
++++test_draw()|code-block|syntax|javascript|4414062|​|4414063|📷|atomic|offset|length|4414064|4414065|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/93396a34266d210e34a9ab1d7c21cb96.png|imageAlt^0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Z|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|10|8|@]|9|@$L|11|M|12|1|13]]|A|$]]|$1|N|3|H|5|6|7|14|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V|W|-4]]]]

let's me give a more detail example:

<pre><code>import numpy as np
import matplotlib.pyplot as plt


def draw_result(lst_iter, lst_loss, lst_acc, title):
 plt.plot(lst_iter, lst_loss, '-b', label='loss')
 plt.plot(lst_iter, lst_acc, '-r', label='accuracy')

 plt.xlabel("n iteration")
 plt.legend(loc='upper left')
 plt.title(title)
 plt.savefig(title+".png") # should before plt.show method

 plt.show()


def test_draw():
 lst_iter = range(100)
 lst_loss = [0.01 * i + 0.01 * i ** 2 for i in xrange(100)]
 # lst_loss = np.random.randn(1, 100).reshape((100, ))
 lst_acc = [0.01 * i - 0.01 * i ** 2 for i in xrange(100)]
 # lst_acc = np.random.randn(1, 100).reshape((100, ))
 draw_result(lst_iter, lst_loss, lst_acc, "sgd_method")


if __name__ == '__main__':
 test_draw()
</code></pre>

<a href="https://i.stack.imgur.com/zWZls.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zWZls.png" alt="enter image description here"></a>

blocks|key|375006|text|更改functions+fixed++for+me的顺序：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|375007|保存并显示plot|375008|then++plot|unordered-list-item|375009|375010|如下所示：|375011|plt.savefig('heatmap.png')

plt.show()|code-block|syntax|javascript|375012|entityMap^0|C|6|0|0|0|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|K|3|-4|5|6|7|11|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|12|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|13|8|@]|D|@]|E|$Q|R]]|$1|S|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|T|$]]

change the order of the functions fixed the problem for me:

<ul>
<li>first Save the plot</li>
<li>then Show the plot</li>
</ul>

as following:

<pre><code>plt.savefig('heatmap.png')

plt.show()
</code></pre>

blocks|key|375055|text|在show()之前调用savefig对我很有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|375056|fig+,ax+=+plt.subplots(figsize+=+(4,4))
sns.barplot(x='sex',+y='tip',+color='g',+ax=ax,data=tips)
sns.barplot(x='sex',+y='tip',+color='b',+ax=ax,data=tips)
ax.legend(['Male','Female'],+facecolor='w')

plt.savefig('figure.png')
plt.show()|code-block|syntax|javascript|375057|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Calling savefig before show() worked for me.

<pre><code>fig ,ax = plt.subplots(figsize = (4,4))
sns.barplot(x='sex', y='tip', color='g', ax=ax,data=tips)
sns.barplot(x='sex', y='tip', color='b', ax=ax,data=tips)
ax.legend(['Male','Female'], facecolor='w')

plt.savefig('figure.png')
plt.show()
</code></pre>

I am trying to save plots I make using matplotlib; however, the images are saving blank.

Here is my code:

<pre><code>plt.subplot(121)
plt.imshow(dataStack, cmap=mpl.cm.bone)

plt.subplot(122)
y = copy.deepcopy(tumorStack)
y = np.ma.masked_where(y == 0, y)

plt.imshow(dataStack, cmap=mpl.cm.bone)
plt.imshow(y, cmap=mpl.cm.jet_r, interpolation='nearest')

if T0 is not None:
 plt.subplot(123)
 plt.imshow(T0, cmap=mpl.cm.bone)

 #plt.subplot(124)
 #Autozoom

#else:
 #plt.subplot(124)
 #Autozoom

plt.show()
plt.draw()
plt.savefig('tessstttyyy.png', dpi=100)
</code></pre>

And tessstttyyy.png is blank (also tried with .jpg)

Matplotlib (pyplot) savefig outputs blank image

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我正在尝试保存使用matplotlib创建的绘图；但是，图像保存为空白。下面是我的代码：plt.subplot(121)plt.imshow(dataStack, cmap=mpl.cm.bone)plt.subplot(122)y = copy.deepcopy(tumorStack)y = np.ma.masked...

问Matplotlib (pyplot) savefig输出空白图像
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Matplotlib (pyplot) savefig输出空白图像EN