codekingpro/portable-devtools
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Q/ SQ/S.S/ SQ/ SQ/S.S/ SQ/ SQ/S.S/ SQ/ SQ/S.S/ S Q/ SQ/S.S. rg)u 4JPEG quality settings equivalent to the Photoshop settings.5Can be used when saving JPEG files.6 7The following presets are available by default:8``web_low``, ``web_medium``, ``web_high``, ``web_very_high``, ``web_maximum``,9``low``, ``medium``, ``high``, ``maximum``.10More presets can be added to the :py:data:`presets` dict if needed.11 12To apply the preset, specify::13 14 quality="preset_name"15 16To apply only the quantization table::17 18 qtables="preset_name"19 20To apply only the subsampling setting::21 22 subsampling="preset_name"23 24Example::25 26 im.save("image_name.jpg", quality="web_high")27 28Subsampling29-----------30 31Subsampling is the practice of encoding images by implementing less resolution32for chroma information than for luma information.33(ref.: https://en.wikipedia.org/wiki/Chroma_subsampling)34 35Possible subsampling values are 0, 1 and 2 that correspond to 4:4:4, 4:2:2 and364:2:0.37 38You can get the subsampling of a JPEG with the39:func:`.JpegImagePlugin.get_sampling` function.40 41In JPEG compressed data a JPEG marker is used instead of an EXIF tag.42(ref.: https://exiv2.org/tags.html)43 44 45Quantization tables46-------------------47 48They are values use by the DCT (Discrete cosine transform) to remove49*unnecessary* information from the image (the lossy part of the compression).50(ref.: https://en.wikipedia.org/wiki/Quantization_matrix#Quantization_matrices,51https://en.wikipedia.org/wiki/JPEG#Quantization)52 53You can get the quantization tables of a JPEG with::54 55 im.quantization56 57This will return a dict with a number of lists. You can pass this dict58directly as the qtables argument when saving a JPEG.59 60The quantization table format in presets is a list with sublists. These formats61are interchangeable.62 63Libjpeg ref.:64https://web.archive.org/web/20120328125543/http://www.jpegcameras.com/libjpeg/libjpeg-3.html65 66� )� annotations� )@� � � �' �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 r67 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 �
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