bokeh (python) export_svgs不渲染图像alpha
bokeh (python) export_svgs不渲染图像alpha
提问于 2018-06-07 00:54:22
我在让bokeh.io.export_svgs()正确输出带有alpha的图像时遇到了问题。
玩具示例：
import numpy as np
import bokeh.plotting as bk_plt
import bokeh.io as bk_io
bk_plt.output_notebook()
N = 500
x = np.linspace(0, 10, N)
y = np.linspace(0, 10, N)
xx, yy = np.meshgrid(x, y)
d = np.sin(xx)*np.cos(yy)
p1 = bk_plt.figure(x_range=(0, 10), y_range=(0, 10))
p1.image(image=[d], x=0, y=0, dw=10, dh=10, palette="Spectral11", alpha = 0.5)
bk_plt.show(p1)
p2 = bk_plt.figure(x_range=(0, 10), y_range=(0, 10))
p2.image(image=[d], x=0, y=0, dw=10, dh=10, palette="Spectral11", alpha = 0.5)
p2.output_backend = 'svg'
bk_io.export_svgs(p2, filename = 'asdf.svg')
bk_plt.show(p2)Bokeh正确地将此输出到notebook：
export_svgs()错误地输出以下内容：
有什么简单的方法可以解决这个问题吗？
回答 1
Stack Overflow用户
发布于 2018-06-07 06:06:04
找到了一个可行的解决方案-创建一个rgba图像并绘制它：
import numpy as np
import bokeh.plotting as bk_plt
import bokeh.palettes as bk_pal
import bokeh.io as bk_io
bk_plt.output_notebook()
N = 500
x = np.linspace(0, 10, N)
y = np.linspace(0, 10, N)
xx, yy = np.meshgrid(x, y)
d = np.sin(xx)*np.cos(yy)
def Make_RGBA(Val, Palette, alpha):
X, Y = Val.shape
Pal = [tuple(int(P[i:i+2], 16) for i in (1, 3 ,5)) for P in Palette]
a = (len(Pal)) / (Val.max() - Val.min())
b = Val.min()
Temp_Val = (a * (Val - b)).astype(int)
Temp_Val = np.minimum(Temp_Val, len(Pal) - 1)
img = np.empty((X, Y), dtype=np.uint32)
view = img.view(dtype=np.uint8).reshape((X, Y, 4))
for i in range(X):
for j in range(Y):
view[i, j, 0] = Pal[Temp_Val[i][j]][0]
view[i, j, 1] = Pal[Temp_Val[i][j]][1]
view[i, j, 2] = Pal[Temp_Val[i][j]][2]
view[i, j, 3] = 255 * alpha
return img
img = Make_RGBA(d, bk_pal.Spectral11, 0.5)
p1 = bk_plt.figure(x_range=(0, 10), y_range=(0, 10))
p1.image(image=[d], x=0, y=0, dw=10, dh=10, palette="Spectral11", alpha = 0.5)
bk_plt.show(p1)
p2 = bk_plt.figure(x_range=(0, 10), y_range=(0, 10))
p2.image_rgba(image=[img], x=[0], y=[0], dw=[10], dh=[10])
p2.output_backend = 'svg'
bk_io.export_svgs(p2, filename = 'asdf.svg')
bk_plt.show(p2)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50725715
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