tuple object does not support item assignment

Question

I am using the PIL library   I am trying to make an image look red-er  this is what i ve got   from PIL import Image image   Image open  balloon jpg   pixels   list image getdata    for pixel in pixels       pixel 0    pixel 0    20     image putdata pixels  image save  new bmp     However I get this error  TypeError   tuple  object does not support item assignment

User · Answer

You probably want the next transformation for you pixels   pixels   map list  image getdata

User · Answer

You have misspelt the second pixels as pixel  The following works   pixels    1 2 3  pixels 0    5   It appears that due to the typo you were trying to accidentally modify some tuple called pixel  and in Python tuples are immutable  Hence the confusing error message

User · Answer

Tuples  in python can t have their values changed  If you d like to change the contained values though I suggest using a list    1 2 3  not  1 2 3

User · Answer

A tuple is immutable and thus you get the error you posted    gt  gt  gt  pixels    1  2  3   gt  gt  gt  pixels 0    5  gt  gt  gt  pixels    1  2  3   gt  gt  gt  pixels 0    5 Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  TypeError   tuple  object does not support item assignment   In your specific case  as correctly pointed out in other answers  you should write   pixel    pixel 0    20  pixel 1   pixel 2

User · Answer

PIL pixels are tuples  and tuples are immutable  You need to construct a new tuple  So  instead of the for loop  do   pixels     pixel 0    20  pixel 1   pixel 2   for pixel in pixels  image putdata pixels    Also  if the pixel is already too red  adding 20 will overflow the value  You probably want something like min pixel 0    20  255  or int 255    pixel 0    255      0 9  instead of pixel 0    20   And  to be able to handle images in lots of different formats  do image   image convert  RGB   after opening the image  The convert method will ensure that the pixels are always  r  g  b  tuples

User · Answer

The second line should have been pixels 0   with an S  You probably have a tuple named pixel  and tuples are immutable  Construct new pixels instead   image   Image open  balloon jpg    pixels     pix 0    20     pix 1   for pix in image getdata     image putdate pixels

[python] 'tuple' object does not support item assignment

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