I am new to Python coding and I am writing a program in which I will be cropping an entered image and then saving it in a location. Now, I am being able to do this using a combination of PIL and pygame. But the problem is that, when I am selecting the image from the open pygame window, the selection area is totally opaque and I am not able to see through the region I am selecting. This is causing problems for my boss who wants to be able to see through it as he selects. For you guys to better understand the problem, I am writing my code here:
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)
Any help is appreciated. Regards.
The image processing library Pillow (PIL) of Python provides Image. crop() for cutting out a partial area of an image.
There is no specific function for cropping using OpenCV, NumPy array slicing is what does the job. Every image that is read in, gets stored in a 2D array (for each color channel). Simply specify the height and width (in pixels) of the area to be cropped. And it's done!
You can resize multiple images in Python with the awesome PIL library and a small help of the os (operating system) library. By using os. listdir() function you can read all the file names in a directory. After that, all you have to do is to create a for loop to open, resize and save each image in the directory.
I took a quick look and fixed a few other problems along the way. Essentially my changes do this:
Here is a screenshot of running the fixed code:
I split the code into two parts to avoid the scrollbars:
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)
And part 2 (concatenate to the above):
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)
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