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JpegPresets.cpython-310.pyc
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o Z#�a;0 � @ s� d Z dg d�g d�gd�dg d�g d�gd�dg d�g d �gd�dg d �g d �gd�dg d �g d �gd�dg d�g d�gd�dg d�g d�gd�dg d�g d�gd�dg d �g d�gd�d� ZdS )u JPEG quality settings equivalent to the Photoshop settings. Can be used when saving JPEG files. The following presets are available by default: ``web_low``, ``web_medium``, ``web_high``, ``web_very_high``, ``web_maximum``, ``low``, ``medium``, ``high``, ``maximum``. More presets can be added to the :py:data:`presets` dict if needed. To apply the preset, specify:: quality="preset_name" To apply only the quantization table:: qtables="preset_name" To apply only the subsampling setting:: subsampling="preset_name" Example:: im.save("image_name.jpg", quality="web_high") Subsampling ----------- Subsampling is the practice of encoding images by implementing less resolution for chroma information than for luma information. (ref.: https://en.wikipedia.org/wiki/Chroma_subsampling) Possible subsampling values are 0, 1 and 2 that correspond to 4:4:4, 4:2:2 and 4:2:0. You can get the subsampling of a JPEG with the :func:`.JpegImagePlugin.get_sampling` function. In JPEG compressed data a JPEG marker is used instead of an EXIF tag. (ref.: https://www.exiv2.org/tags.html) Quantization tables ------------------- They are values use by the DCT (Discrete cosine transform) to remove *unnecessary* information from the image (the lossy part of the compression). (ref.: https://en.wikipedia.org/wiki/Quantization_matrix#Quantization_matrices, https://en.wikipedia.org/wiki/JPEG#Quantization) You can get the quantization tables of a JPEG with:: im.quantization This will return a dict with a number of lists. You can pass this dict directly as the qtables argument when saving a JPEG. The quantization table format in presets is a list with sublists. These formats are interchangeable. Libjpeg ref.: https://web.archive.org/web/20120328125543/http://www.jpegcameras.com/libjpeg/libjpeg-3.html � )@� � � �' �2 �. �> �D r � � �& r �5 �A r r r � r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r )@� r � r �6 r r r r � � r r r r r r r r �+ �B r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r )� subsampling� quantization)@r � r r r � r � r � r � r r r r r r � r r � �# �/ r r r r r �% r! �@ r r r r r �3 r# r# r r r r" r$ r# r# r# r r r r! r# r# r# r# r r r! r# r# r# r# r# )@� r r% r r r r �0 r � r r% r r r r r% r r � r r r r r r% r( r r r r r# r r r r r r& r# r# r r r r r& �? r# r# r r r r r# r# r# r# r& r r r# r# r# r# r# � )@� � r, r+ � r r r r, � r. r+ � � r r r, r. r. r+ r0 r � r' r+ r+ r+ r r r r' r r- r/ r0 r r r r r r r0 r r r r r r r r r1 r' r r r r r r r' r r r r r )@� r2 r r r r r r r2 r r r r r r r r r r% r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r )@r r r r � r, r. r+ r r r r r3 r, r. r+ r r r r r, r. r2 r- r r r r, r. r2 r- r r3 r3 r, r. r/ r0 r r r, r, r. r2 r0 r r r r. r. r2 r- r r r r r+ r+ r- r r r r r )@r3 r3 r. r- r r r r r3 r, r+ r r1 r r r r. r+ r- r1 r r r r r- r r1 r r r r r r r1 r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r )@� r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r4 r r4 r4 r4 r4 r4 r4 r r r4 r4 r4 r4 r4 r r r3 r4 r4 r4 r4 r r r3 r3 r4 r4 r4 r r r3 r3 r3 r4 r4 r r r3 r3 r3 r3 )@r4 r4 r4 r r r3 r3 r3 r4 r4 r4 r r3 r3 r3 r3 r4 r4 r4 r3 r3 r3 r3 r3 r r r3 r3 r3 r3 r3 r3 r r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 r3 )@r r1 r1 r r r �" r% r1 r r r' r r r r r1 r r% r r r r r r r' r r r r r r r r r r r r r r r r r r r r r r r5 r r r r r r r r% r r r r r r r )@r r' r( r r r r% r% r' r r r1 r1 r r r r( r r1 r1 r r r r r r1 r1 r r r r r r r1 r r r r r r r r r r r r r r r% r r r r r r r r% r r r r r r r )@r r/ r/ r r% r r r% r/ r- r- r r r' r r r/ r- r0 r r' r r r r r r r r r r r r% r r' r r r r r r r' r r r r r r r r r r r r r r r% r r r r r r r )@r r r r r r r% r% r r1 r1 r1 r1 r r r r r1 r1 r1 r r r r r r1 r1 r r r r r r r1 r r r r r r r r r r r r r r r% r r r r r r r r% r r r r r r r )@r+ r, r, r+ r- r r r r, r. r. r+ r/ r0 r r r, r. r. r+ r0 r r r r+ r+ r+ r r r r r r- r/ r0 r r r r r r r0 r r r r r r r r r r r r r r r r r r r r r r )@r2 r2 r r r r r% r% r2 r r r1 r1 r r r r r r1 r1 r r r r r r1 r1 r r r r r r r1 r r r r r r r r r r r r r r r% r r r r r r r r% r r r r r r r )@r3 r3 r. r- r r r r r3 r, r+ r0 r1 r r r r. r+ r- r1 r r r r r- r0 r1 r r r r r r r1 r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r ) �web_low� web_medium�web_high� web_very_high� web_maximum�low�medium�high�maximumN)�__doc__�presets� rA rA �1/usr/lib/python3/dist-packages/PIL/JpegPresets.py�<module> s` C������������������ � �