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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










3















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



enter image description here



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?










share|improve this question
























  • 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
















3















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



enter image description here



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?










share|improve this question
























  • 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














3












3








3








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



enter image description here



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?










share|improve this question
















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



enter image description here



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






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 13 hours ago







jdhao

















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 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


















  • 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

















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













2 Answers
2






active

oldest

votes


















1














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.






share|improve this answer








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.



























    1














    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).






    share|improve this answer























    • 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










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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    1














    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.






    share|improve this answer








    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.
























      1














      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.






      share|improve this answer








      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.






















        1












        1








        1







        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.






        share|improve this answer








        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.







        share|improve this answer








        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.









        share|improve this answer



        share|improve this answer






        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




        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.























            1














            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).






            share|improve this answer























            • 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















            1














            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).






            share|improve this answer























            • 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













            1












            1








            1







            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).






            share|improve this answer













            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).







            share|improve this answer












            share|improve this answer



            share|improve this answer










            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

















            • 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

















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