Adding option to specify/keep quantization tables when saving to JPEG - issue #42

[etienned]

Alex,

Basically what need to be test is:

1. is it compiling correctly?
2. open a JPEG image saved from Photoshop (so it's quantization tables will not be from libjpeg), check the quantization table (im.quantization), then save this image with:

im.save('new_name.jpg', quality='keep')

Reopen this new image and compare the quantization table to the first one, they should be identical.

Sorry for not having proper tests.

[aclark4life]

Thanks!

[savyan]

I am a beginner to pillow and python. I am trying to specify a present quantization table, but when i try the following code:

im1=Image.open('lena.jpg')
qt1=im1.quantization
print 'The qtable of lena.jpg'
print qt1 
im2.save("lena1.jpg", qtables="low")
im3=Image.open('lena1.jpg')
print 'The qtable of lena1.jpg'
qt3=im3.quantization
print qt3

but the output of qt3 and qt1 are same. means it is not loading the preset value "low". Why?

[aclark4life]

@savyan This type of question is best asked/answered on stackoverflow with the python and python-imaging-library tags e.g. http://stackoverflow.com/search?q=pil

[savyan]

thank you for the guidance.

[d-schmidt]

@savyan

im2.save("lena1.jpg", quality="low")

[savyan]

On Friday 05 July 2013 06:00 PM, David Schmidt wrote:

@savyan https://github.com/savyan

|im2.save("lena1.jpg", quality="low")
|

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#77 (comment).

@david Schidt
Thanks done it.