[英]Image Cropping using Python
我是 Python 编码的新手,我正在编写一个程序,我将在其中裁剪输入的图像,然后将其保存在某个位置。 现在,我可以使用 PIL 和 pygame 的组合来做到这一点。 但问题是,当我从打开的 pygame window 中选择图像时,选择区域完全不透明,我无法看穿我选择的区域。 这给我的老板带来了问题,他希望能够在他选择的时候看穿它。 为了让你们更好地理解这个问题,我在这里写我的代码:
import pygame, sys
from PIL import Image
pygame.init()
def displayImage( screen, px, topleft):
screen.blit(px, px.get_rect())
if topleft:
pygame.draw.rect( screen, (128,128,128), pygame.Rect(topleft[0], topleft[1], pygame.mouse.get_pos()[0] - topleft[0], pygame.mouse.get_pos()[1] - topleft[1]))
pygame.display.flip()
def setup(path):
px = pygame.image.load(path)
screen = pygame.display.set_mode( px.get_rect()[2:] )
screen.blit(px, px.get_rect())
pygame.display.flip()
return screen, px
def mainLoop(screen, px):
topleft = None
bottomright = None
n=0
while n!=1:
for event in pygame.event.get():
if event.type == pygame.MOUSEBUTTONUP:
if not topleft:
topleft = event.pos
else:
bottomright = event.pos
n=1
displayImage(screen, px, topleft)
return ( topleft + bottomright )
if __name__ == "__main__":
input_loc="C:\pic1.PNG"
output_loc="C:\pic2.PNG"
screen, px = setup(input_loc)
left, upper, right, lower = mainLoop(screen, px)
im = Image.open(input_loc)
im = im.crop(( left, upper, right, lower))
pygame.display.quit()
im.save(output_loc)
任何帮助表示赞赏。 问候。
我快速浏览了一下,并在此过程中解决了一些其他问题。 基本上我的更改是这样做的:
这是运行固定代码的屏幕截图:
我将代码分成两部分以避免滚动条:
import pygame, sys
from PIL import Image
pygame.init()
def displayImage(screen, px, topleft, prior):
# ensure that the rect always has positive width, height
x, y = topleft
width = pygame.mouse.get_pos()[0] - topleft[0]
height = pygame.mouse.get_pos()[1] - topleft[1]
if width < 0:
x += width
width = abs(width)
if height < 0:
y += height
height = abs(height)
# eliminate redundant drawing cycles (when mouse isn't moving)
current = x, y, width, height
if not (width and height):
return current
if current == prior:
return current
# draw transparent box and blit it onto canvas
screen.blit(px, px.get_rect())
im = pygame.Surface((width, height))
im.fill((128, 128, 128))
pygame.draw.rect(im, (32, 32, 32), im.get_rect(), 1)
im.set_alpha(128)
screen.blit(im, (x, y))
pygame.display.flip()
# return current box extents
return (x, y, width, height)
第 2 部分(与上述内容连接):
def setup(path):
px = pygame.image.load(path)
screen = pygame.display.set_mode( px.get_rect()[2:] )
screen.blit(px, px.get_rect())
pygame.display.flip()
return screen, px
def mainLoop(screen, px):
topleft = bottomright = prior = None
n=0
while n!=1:
for event in pygame.event.get():
if event.type == pygame.MOUSEBUTTONUP:
if not topleft:
topleft = event.pos
else:
bottomright = event.pos
n=1
if topleft:
prior = displayImage(screen, px, topleft, prior)
return ( topleft + bottomright )
if __name__ == "__main__":
input_loc = 'stack.png'
output_loc = 'out.png'
screen, px = setup(input_loc)
left, upper, right, lower = mainLoop(screen, px)
# ensure output rect always has positive width, height
if right < left:
left, right = right, left
if lower < upper:
lower, upper = upper, lower
im = Image.open(input_loc)
im = im.crop(( left, upper, right, lower))
pygame.display.quit()
im.save(output_loc)
samplebias 的答案对我来说很棒。 我通过添加缩放和平移功能为我正在使用的大图像扩展了它。
import pygame, sys
from pygame.locals import K_a, K_s,K_w,K_d,K_LEFTBRACKET,K_RIGHTBRACKET
from PIL import Image
pygame.init()
BG_COLOR = (0,0,0)
def displayRect(screen, px, topleft, prior,pos,scale):
# ensure that the rect always has positive width, height
#topleft = [(val-pos[i])/scale for i,val in enumerate(topleft)]
topleft = [(val/scale-pos[i]) for i,val in enumerate(topleft)]
x, y = topleft
bottomright = pygame.mouse.get_pos()
width = bottomright[0] - topleft[0]
height = bottomright[1] - topleft[1]
if width < 0:
x += width
width = abs(width)
if height < 0:
y += height
height = abs(height)
# eliminate redundant drawing cycles (when mouse isn't moving)
current = x, y, width, height
if not (width and height):
return current
if current == prior:
return current
# draw transparent box and blit it onto canvas
rect = px.get_rect()
px = pygame.transform.scale(px,[rect.width/scale, rect.height/scale])
screen.blit(px, (rect[0]-pos[0],rect[1]-pos[1]))
im = pygame.Surface((width, height))
im.fill((128, 128, 128))
pygame.draw.rect(im, (32, 32, 32), im.get_rect(), 1)
im.set_alpha(128)
screen.blit(im, (x, y))
pygame.display.flip()
# return current box extents
return (x, y, width, height)
def setup(px):
screen = pygame.display.set_mode( px.get_rect()[2:] )
screen.blit(px, px.get_rect())
pygame.display.flip()
return screen, px
def move(pos,scale,px,screen):
x,y = pos
#print pos,x
rect = px.get_rect()
screen.fill(BG_COLOR)
px = pygame.transform.scale(px,[rect.width/scale, rect.height/scale])
screen.blit(px, (rect[0]-x,rect[1]-y))
pygame.display.flip()
#px.rect.topleft = pr.rect.topleft[0] - x,
def mainLoop(screen, px, filelist):
topleft = bottomright = prior = None
n=0
scale = 1
pos = [0,0]
while n!=1:
for event in pygame.event.get():
if event.type == pygame.MOUSEBUTTONUP:
if not topleft:
topleft = [(val+pos[i])*scale for i,val in enumerate(event.pos)]
print "tr: ",topleft
else:
bottomright = [(val+pos[i])*scale for i,val in enumerate(event.pos)]
print "br: ",bottomright
n=1
if event.type == pygame.KEYDOWN and event.key == K_a:
pos = [pos[0]-200,pos[1]]
move(pos,scale,px,screen)
if event.type == pygame.KEYDOWN and event.key == K_d:
pos = [pos[0]+200,pos[1]]
move(pos,scale,px,screen)
if event.type == pygame.KEYDOWN and event.key == K_w:
pos = [pos[0],pos[1]-200]
move(pos,scale,px,screen)
if event.type == pygame.KEYDOWN and event.key == K_s:
pos = [pos[0],pos[1]+200]
move(pos,scale,px,screen)
if event.type == pygame.KEYDOWN and event.key == K_RIGHTBRACKET:
scale = scale/1.25
move(pos,scale,px,screen)
if event.type == pygame.KEYDOWN and event.key == K_LEFTBRACKET:
scale = scale*1.25
move(pos,scale,px,screen)
if topleft:
prior = displayRect(screen, px, topleft, prior,pos,scale)
return ( topleft + bottomright )
使用提供的主要function 样本偏差。
感谢堆栈溢出!
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