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Image does not change when adding an alpha channel
2019 Community Moderator ElectionWhat does the “yield” keyword do?Does Python have a ternary conditional operator?What does if __name__ == “__main__”: do?Lazy load of images in ListViewDoes Python have a string 'contains' substring method?Use a color to create an alpha channel for a PNG?How to install packages using pip according to the requirements.txt file from a local directory?Image Processing: Algorithm Improvement for 'Coca-Cola Can' RecognitionAdding an alpha channel to a Monochrome Image using Open CV PythonTkinter image with alpha channel works as desired in windows but not linux
The pillow package has a method called Image.putalpha() which is used to add or change the alpha channel of an image.
I tried to play with this method and found that I can not change the background color of an image. The original image is
This is my code to add alpha to it
from PIL import Image
im_owl = Image.open("owl.jpg")
alpha = Image.new("L", im_owl.size, 50)
im_owl.putalpha(alpha)
im_owl.show()
The produced image is nothing different from the original image. I have tried with different value of alpha and see no difference.
What could have been wrong?
python image image-processing python-imaging-library alpha
asked 13 hours ago
jdhaojdhao
4,34412445
add a comment |
The pillow package has a method called Image.putalpha() which is used to add or change the alpha channel of an image.
I tried to play with this method and found that I can not change the background color of an image. The original image is
This is my code to add alpha to it
from PIL import Image
im_owl = Image.open("owl.jpg")
alpha = Image.new("L", im_owl.size, 50)
im_owl.putalpha(alpha)
im_owl.show()
The produced image is nothing different from the original image. I have tried with different value of alpha and see no difference.
What could have been wrong?
python image image-processing python-imaging-library alpha
asked 13 hours ago
jdhaojdhao
4,34412445
Aren't you suppose to first create the image with alpha channel?cv2.COLOR_RGB2RGBA
– DirtyBit
13 hours ago
You can read the doc aboutImage.putalpha(), which does not require image to be with an alpha channel before hand. There is no OpenCV involved in this question.
– jdhao
13 hours ago
add a comment |
The pillow package has a method called Image.putalpha() which is used to add or change the alpha channel of an image.
I tried to play with this method and found that I can not change the background color of an image. The original image is
This is my code to add alpha to it
from PIL import Image
im_owl = Image.open("owl.jpg")
alpha = Image.new("L", im_owl.size, 50)
im_owl.putalpha(alpha)
im_owl.show()
The produced image is nothing different from the original image. I have tried with different value of alpha and see no difference.
What could have been wrong?
python image image-processing python-imaging-library alpha
asked 13 hours ago
jdhaojdhao
4,34412445
The pillow package has a method called Image.putalpha() which is used to add or change the alpha channel of an image.
I tried to play with this method and found that I can not change the background color of an image. The original image is
This is my code to add alpha to it
from PIL import Image
im_owl = Image.open("owl.jpg")
alpha = Image.new("L", im_owl.size, 50)
im_owl.putalpha(alpha)
im_owl.show()
The produced image is nothing different from the original image. I have tried with different value of alpha and see no difference.
What could have been wrong?
python image image-processing python-imaging-library alpha
python image image-processing python-imaging-library alpha
asked 13 hours ago
jdhaojdhao
4,34412445
asked 13 hours ago
jdhaojdhao
4,34412445
edited 13 hours ago
jdhao
asked 13 hours ago
jdhaojdhao
4,34412445
asked 13 hours ago
jdhaojdhao
4,34412445
asked 13 hours ago
jdhaojdhao
4,34412445
4,34412445
Aren't you suppose to first create the image with alpha channel?cv2.COLOR_RGB2RGBA
– DirtyBit
13 hours ago
You can read the doc aboutImage.putalpha(), which does not require image to be with an alpha channel before hand. There is no OpenCV involved in this question.
– jdhao
13 hours ago
add a comment |
Aren't you suppose to first create the image with alpha channel?cv2.COLOR_RGB2RGBA
– DirtyBit
13 hours ago
You can read the doc aboutImage.putalpha(), which does not require image to be with an alpha channel before hand. There is no OpenCV involved in this question.
– jdhao
13 hours ago
Aren't you suppose to first create the image with alpha channel?
cv2.COLOR_RGB2RGBA– DirtyBit
13 hours ago
Aren't you suppose to first create the image with alpha channel?
cv2.COLOR_RGB2RGBA– DirtyBit
13 hours ago
You can read the doc about
Image.putalpha(), which does not require image to be with an alpha channel before hand. There is no OpenCV involved in this question.– jdhao
13 hours ago
You can read the doc about
Image.putalpha(), which does not require image to be with an alpha channel before hand. There is no OpenCV involved in this question.– jdhao
13 hours ago
add a comment |
2 Answers
2
active
oldest
votes
try to save the image and see it.
I am also not able to see the image directly from
im_owl.show()
but when I saved it
im_owl.save()
I am able to see the image changed.
answered 13 hours ago
sanyamsanyam
311
New contributor
sanyam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
Try using
im_owl.save("alphadOwl.png")
And then view the saved image. It would seem that the alpha channel isn't applied to bmp or jpg files. It is a bmp file that gets displayed with im.show()
(For the record, I'm on a mac, I don't know if im.show() uses different applications on other devices).
answered 13 hours ago
PamPam
6911513
Thanks, it seems the image is shown as bmp file, which does not use alpha channel.
– jdhao
12 hours ago
Might be worth looking at what happens when you read it back in to a PIL image - does the alpha channel remain?
– Pam
11 hours ago
add a comment |
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2 Answers
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active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
try to save the image and see it.
I am also not able to see the image directly from
im_owl.show()
but when I saved it
im_owl.save()
I am able to see the image changed.
answered 13 hours ago
sanyamsanyam
311
New contributor
sanyam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
try to save the image and see it.
I am also not able to see the image directly from
im_owl.show()
but when I saved it
im_owl.save()
I am able to see the image changed.
answered 13 hours ago
sanyamsanyam
311
New contributor
sanyam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
try to save the image and see it.
I am also not able to see the image directly from
im_owl.show()
but when I saved it
im_owl.save()
I am able to see the image changed.
answered 13 hours ago
sanyamsanyam
311
New contributor
sanyam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
try to save the image and see it.
I am also not able to see the image directly from
im_owl.show()
but when I saved it
im_owl.save()
I am able to see the image changed.
answered 13 hours ago
sanyamsanyam
311
New contributor
sanyam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 13 hours ago
sanyamsanyam
311
New contributor
sanyam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 13 hours ago
sanyamsanyam
311
answered 13 hours ago
sanyamsanyam
311
311
New contributor
sanyam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
sanyam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
sanyam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
Try using
im_owl.save("alphadOwl.png")
And then view the saved image. It would seem that the alpha channel isn't applied to bmp or jpg files. It is a bmp file that gets displayed with im.show()
(For the record, I'm on a mac, I don't know if im.show() uses different applications on other devices).
answered 13 hours ago
PamPam
6911513
Thanks, it seems the image is shown as bmp file, which does not use alpha channel.
– jdhao
12 hours ago
Might be worth looking at what happens when you read it back in to a PIL image - does the alpha channel remain?
– Pam
11 hours ago
add a comment |
Try using
im_owl.save("alphadOwl.png")
And then view the saved image. It would seem that the alpha channel isn't applied to bmp or jpg files. It is a bmp file that gets displayed with im.show()
(For the record, I'm on a mac, I don't know if im.show() uses different applications on other devices).
answered 13 hours ago
PamPam
6911513
Thanks, it seems the image is shown as bmp file, which does not use alpha channel.
– jdhao
12 hours ago
Might be worth looking at what happens when you read it back in to a PIL image - does the alpha channel remain?
– Pam
11 hours ago
add a comment |
Try using
im_owl.save("alphadOwl.png")
And then view the saved image. It would seem that the alpha channel isn't applied to bmp or jpg files. It is a bmp file that gets displayed with im.show()
(For the record, I'm on a mac, I don't know if im.show() uses different applications on other devices).
answered 13 hours ago
PamPam
6911513
Try using
im_owl.save("alphadOwl.png")
And then view the saved image. It would seem that the alpha channel isn't applied to bmp or jpg files. It is a bmp file that gets displayed with im.show()
(For the record, I'm on a mac, I don't know if im.show() uses different applications on other devices).
answered 13 hours ago
PamPam
6911513
answered 13 hours ago
PamPam
6911513
answered 13 hours ago
PamPam
6911513
answered 13 hours ago
PamPam
6911513
6911513
Thanks, it seems the image is shown as bmp file, which does not use alpha channel.
– jdhao
12 hours ago
Might be worth looking at what happens when you read it back in to a PIL image - does the alpha channel remain?
– Pam
11 hours ago
add a comment |
Thanks, it seems the image is shown as bmp file, which does not use alpha channel.
– jdhao
12 hours ago
Might be worth looking at what happens when you read it back in to a PIL image - does the alpha channel remain?
– Pam
11 hours ago
Thanks, it seems the image is shown as bmp file, which does not use alpha channel.
– jdhao
12 hours ago
Thanks, it seems the image is shown as bmp file, which does not use alpha channel.
– jdhao
12 hours ago
Might be worth looking at what happens when you read it back in to a PIL image - does the alpha channel remain?
– Pam
11 hours ago
Might be worth looking at what happens when you read it back in to a PIL image - does the alpha channel remain?
– Pam
11 hours ago
add a comment |
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Aren't you suppose to first create the image with alpha channel?
cv2.COLOR_RGB2RGBA– DirtyBit
13 hours ago
You can read the doc about
Image.putalpha(), which does not require image to be with an alpha channel before hand. There is no OpenCV involved in this question.– jdhao
13 hours ago