减小矢量化轮廓图的大小 [英] Reducing size of vectorized contourplot
问题描述
我想在pdf文档中包含一个填充轮廓图(例如TeX文档)。
目前我正在使用 pyplot
s contourf
,并使用 pdf
> pyplot s savefig
。问题在于,与高分辨率 png
相比,图的大小变得相当大。
减小尺寸的一种方法当然是减少情节中的等级数量,但是太少的情节会导致情节不佳。我正在寻找一种简单的方法,例如让绘图的颜色保存为png,并将轴,刻度等以向量化方式保存。
任何与一个 例如: 您可以看到这个matplotlib示例以获取更多背景信息。 在不影响它的 I would like to include a filled contour plot to a pdf document (for example a TeX document).
Currently I am using One way to reduce the size is of course to reduce the number of levels in the plot, but too few levels gives a poor plot. I'm searching for a simple way to for example let the colors of the plot be saved as a png, with the axes, ticks etc. to be saved vectorized. You can do this using the Anything with a For example: You can see this matplotlib example for more background info. As pointed out by @tcaswell, to rasterise just one artist without having to affect its
这篇关于减小矢量化轮廓图的大小的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋! zorder
小于设置的值将被保存为光栅化图形,即使保存为 pdf $ c $
pre $ import matplotlib.pyplot as plt
导入numpy为np
data = np.random.rand(500,500)
#fig1将contourf保存为矢量
fig1, ax1 = plt.subplots(1)
ax1.contourf(data)
fig1.savefig('vector.pdf')
#fig2将contourf保存为栅格
fig2,ax2 = plt.subplots(1)
ax2.contourf(data,zorde r = -20)
ax2.set_rasterization_zorder(-10)
fig2.savefig('raster.pdf')
#显示文件大小的差异。 os.stat().st_size以字节为单位给出文件大小。
print os.stat('vector.pdf')。st_size
#15998481
print os.stat('raster.pdf')。st_size
#1186334
zorder
的情况下光栅化一个艺术家,您可以使用 .set_rasterized
。但是,对于 contourf
,这似乎不是一个选项,所以您需要循环创建的 PathCollections
。由 contourf
和 set_rasterized
在它们中的每一个上。就像这样:
contours = ax.contourf(data)
for contours.collections中的pathcoll:
pathcoll.set_rasterized(True)
pyplot
s contourf
, and saving to pdf
with pyplot
s savefig
. The problem with this is that the size of the plots becomes rather big as compared to a high resolution png
.Axes
option set_rasterization_zorder
.zorder
less than what you set that to be will be saved as rasterized graphics, even when saving to a vector format like pdf
.import matplotlib.pyplot as plt
import numpy as np
data = np.random.rand(500,500)
# fig1 will save the contourf as a vector
fig1,ax1 = plt.subplots(1)
ax1.contourf(data)
fig1.savefig('vector.pdf')
# fig2 will save the contourf as a raster
fig2,ax2 = plt.subplots(1)
ax2.contourf(data,zorder=-20)
ax2.set_rasterization_zorder(-10)
fig2.savefig('raster.pdf')
# Show the difference in file size. "os.stat().st_size" gives the file size in bytes.
print os.stat('vector.pdf').st_size
# 15998481
print os.stat('raster.pdf').st_size
# 1186334
zorder
, you can use .set_rasterized
. However, this doesn't appear to be an option with contourf
, so you would need to loop over the PathCollections
created by contourf
and set_rasterized
on each of them. Something like this:contours = ax.contourf(data)
for pathcoll in contours.collections:
pathcoll.set_rasterized(True)