[英]Plot circular gradients using PIL in Python
我正在使用 Python 創建圖像,使用
myImage = Image.new('RGB', (250, 250), 'rgb(155,89,182)')
這實際上創建了圖像。 但是有沒有辦法創建一個帶有我選擇的顏色背景但帶有漸變的圖像? 我想選擇藍色作為我的顏色,然后,我想要圖像邊緣的深藍色和圖像中心的淺藍色。 使用簡單的 PIL 和 Python 可以嗎?
先感謝您。
代碼取決於您希望漸變的外觀。
您可以將其設置為矩形漸變,如下所示:
或者你可以讓它變成這樣的圓形漸變:
這將是圓形漸變的代碼:
import Image
import math
imgsize = (250, 250) #The size of the image
image = Image.new('RGB', imgsize) #Create the image
innerColor = [80, 80, 255] #Color at the center
outerColor = [0, 0, 80] #Color at the corners
for y in range(imgsize[1]):
for x in range(imgsize[0]):
#Find the distance to the center
distanceToCenter = math.sqrt((x - imgsize[0]/2) ** 2 + (y - imgsize[1]/2) ** 2)
#Make it on a scale from 0 to 1
distanceToCenter = float(distanceToCenter) / (math.sqrt(2) * imgsize[0]/2)
#Calculate r, g, and b values
r = outerColor[0] * distanceToCenter + innerColor[0] * (1 - distanceToCenter)
g = outerColor[1] * distanceToCenter + innerColor[1] * (1 - distanceToCenter)
b = outerColor[2] * distanceToCenter + innerColor[2] * (1 - distanceToCenter)
#Place the pixel
image.putpixel((x, y), (int(r), int(g), int(b)))
image.save('circlegradient.jpg')
對於每個像素,它outerColor
根據像素到中心的距離將紅色、綠色和藍色值設置為介於innerColor
和outerColor
之間的某個位置。
這將是矩形漸變的代碼:
import Image
imgsize = (250, 250) #The size of the image
image = Image.new('RGB', imgsize) #Create the image
innerColor = [80, 80, 255] #Color at the center
outerColor = [0, 0, 80] #Color at the edge
for y in range(imgsize[1]):
for x in range(imgsize[0]):
#Find the distance to the closest edge
distanceToEdge = min(abs(x - imgsize[0]), x, abs(y - imgsize[1]), y)
#Make it on a scale from 0 to 1
distanceToEdge = float(distanceToEdge) / (imgsize[0]/2)
#Calculate r, g, and b values
r = innerColor[0] * distanceToEdge + outerColor[0] * (1 - distanceToEdge)
g = innerColor[1] * distanceToEdge + outerColor[1] * (1 - distanceToEdge)
b = innerColor[2] * distanceToEdge + outerColor[2] * (1 - distanceToEdge)
#Place the pixel
image.putpixel((x, y), (int(r), int(g), int(b)))
image.save('rectgradient.jpg')
這以相同的方式工作,除了它測量到最近邊緣的距離,而不是中心。
做一個漸變線 ax+by+c=0
a = -0.5
b = -1
c = 250
width = 55
imgsize = (180, 320) #The size of the image
image = PIL.Image.new('RGB', imgsize, color="white") #Create the image
innerColor = [255, 0, 0] #Color at the center
outerColor = [0, 0, 0] #Color at the edge
for y in range(imgsize[1]):
for x in range(imgsize[0]):
dist = (a*x + b*y + c)/np.sqrt(a*a+b*b)
color_coef = abs(dist)/width
if abs(dist) < width:
red = outerColor[0] * color_coef + innerColor[0] * (1 - color_coef)
green = outerColor[1] * color_coef + innerColor[1] * (1 - color_coef)
blue = outerColor[2] * color_coef + innerColor[2] * (1 - color_coef)
image.putpixel((x, y), (int(red), int(green), int(blue)))
image.save('linegradient.jpg')
如果他們向我提供 x、y 中的梯度數據,我會這樣做。 這不是中心。
這是他們給我的所有數據:
Spotlight_Size 90.81163
RefractionDepthBias: 0
GradientPOSX: 50
GradientPOSY: 99.68244
GradientSIZE: 121.87289
Spotlight_Intensity: 105
Spotlight_PoSX: 50.192413
Spotlight_PosY: 52.344917
FallOffColor_Fill_Percent: 40
FallOffColor_Postion: 50
和 3 種顏色:
A_COLOR:100600ff
B_COLOR: f7d32aff
FallOff_COLOR: f7d32aff
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