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Name	Size	Permission
__pycache__	[ DIR ]	drwxr-xr-x
BdfFontFile.py	2.75 KB	-rw-r--r--
_binary.py	2 KB	-rw-r--r--
BlpImagePlugin.py	14.23 KB	-rw-r--r--
BmpImagePlugin.py	13.91 KB	-rw-r--r--
BufrStubImagePlugin.py	1.48 KB	-rw-r--r--
ContainerIO.py	2.82 KB	-rw-r--r--
CurImagePlugin.py	1.64 KB	-rw-r--r--
DcxImagePlugin.py	2.09 KB	-rw-r--r--
DdsImagePlugin.py	7.8 KB	-rw-r--r--
EpsImagePlugin.py	11.64 KB	-rw-r--r--
ExifTags.py	9.22 KB	-rw-r--r--
features.py	9.17 KB	-rw-r--r--
FitsStubImagePlugin.py	2.5 KB	-rw-r--r--
FliImagePlugin.py	4.16 KB	-rw-r--r--
FontFile.py	2.7 KB	-rw-r--r--
FpxImagePlugin.py	6.5 KB	-rw-r--r--
FtexImagePlugin.py	3.23 KB	-rw-r--r--
GbrImagePlugin.py	2.73 KB	-rw-r--r--
GdImageFile.py	2.41 KB	-rw-r--r--
GifImagePlugin.py	32.05 KB	-rw-r--r--
GimpGradientFile.py	3.27 KB	-rw-r--r--
GimpPaletteFile.py	1.24 KB	-rw-r--r--
GribStubImagePlugin.py	1.48 KB	-rw-r--r--
Hdf5StubImagePlugin.py	1.48 KB	-rw-r--r--
IcnsImagePlugin.py	11.46 KB	-rw-r--r--
IcoImagePlugin.py	10.57 KB	-rw-r--r--
ImageChops.py	7.13 KB	-rw-r--r--
ImageCms.py	36.22 KB	-rw-r--r--
ImageColor.py	8.52 KB	-rw-r--r--
ImageDraw2.py	4.9 KB	-rw-r--r--
ImageDraw.py	33.9 KB	-rw-r--r--
ImageEnhance.py	3.12 KB	-rw-r--r--
ImageFile.py	20.58 KB	-rw-r--r--
ImageFilter.py	15.75 KB	-rw-r--r--
ImageFont.py	44.29 KB	-rw-r--r--
ImageGrab.py	3.54 KB	-rw-r--r--
ImageMath.py	7.44 KB	-rw-r--r--
ImageMode.py	2.03 KB	-rw-r--r--
ImageMorph.py	7.59 KB	-rw-r--r--
ImageOps.py	19.82 KB	-rw-r--r--
ImagePalette.py	7.66 KB	-rw-r--r--
ImagePath.py	336 B	-rw-r--r--
Image.py	118.51 KB	-rw-r--r--
ImageQt.py	6.54 KB	-rw-r--r--
ImageSequence.py	1.81 KB	-rw-r--r--
ImageShow.py	7.75 KB	-rw-r--r--
ImageStat.py	3.81 KB	-rw-r--r--
ImageTransform.py	2.78 KB	-rw-r--r--
ImageWin.py	7.02 KB	-rw-r--r--
_imagingcms.cpython-310-x86_64-linux-gnu.so	37.8 KB	-rw-r--r--
_imaging.cpython-310-x86_64-linux-gnu.so	438.53 KB	-rw-r--r--
_imagingft.cpython-310-x86_64-linux-gnu.so	41.46 KB	-rw-r--r--
_imagingmath.cpython-310-x86_64-linux-gnu.so	18.43 KB	-rw-r--r--
_imagingmorph.cpython-310-x86_64-linux-gnu.so	14.46 KB	-rw-r--r--
ImImagePlugin.py	10.48 KB	-rw-r--r--
ImtImagePlugin.py	2.15 KB	-rw-r--r--
__init__.py	1.7 KB	-rw-r--r--
IptcImagePlugin.py	5.58 KB	-rw-r--r--
Jpeg2KImagePlugin.py	10.14 KB	-rw-r--r--
JpegImagePlugin.py	27.79 KB	-rw-r--r--
JpegPresets.py	12.06 KB	-rw-r--r--
__main__.py	41 B	-rw-r--r--
McIdasImagePlugin.py	1.71 KB	-rw-r--r--
MicImagePlugin.py	2.55 KB	-rw-r--r--
MpegImagePlugin.py	1.76 KB	-rw-r--r--
MpoImagePlugin.py	4.3 KB	-rw-r--r--
MspImagePlugin.py	5.4 KB	-rw-r--r--
PaletteFile.py	1.08 KB	-rw-r--r--
PalmImagePlugin.py	8.89 KB	-rw-r--r--
PcdImagePlugin.py	1.44 KB	-rw-r--r--
PcfFontFile.py	6.2 KB	-rw-r--r--
PcxImagePlugin.py	5.73 KB	-rw-r--r--
PdfImagePlugin.py	7.16 KB	-rw-r--r--
PdfParser.py	33.75 KB	-rw-r--r--
PixarImagePlugin.py	1.59 KB	-rw-r--r--
PngImagePlugin.py	43.11 KB	-rw-r--r--
PpmImagePlugin.py	4.34 KB	-rw-r--r--
PsdImagePlugin.py	7.88 KB	-rw-r--r--
PSDraw.py	6.56 KB	-rw-r--r--
PyAccess.py	9.38 KB	-rw-r--r--
SgiImagePlugin.py	5.95 KB	-rw-r--r--
SpiderImagePlugin.py	9.31 KB	-rw-r--r--
SunImagePlugin.py	4.18 KB	-rw-r--r--
TarIO.py	1.41 KB	-rw-r--r--
TgaImagePlugin.py	6.32 KB	-rw-r--r--
TiffImagePlugin.py	71.17 KB	-rw-r--r--
TiffTags.py	14.93 KB	-rw-r--r--
_tkinter_finder.py	525 B	-rw-r--r--
_util.py	359 B	-rw-r--r--
_version.py	50 B	-rw-r--r--
WalImageFile.py	5.42 KB	-rw-r--r--
_webp.cpython-310-x86_64-linux-gnu.so	28.09 KB	-rw-r--r--
WebPImagePlugin.py	10.58 KB	-rw-r--r--
WmfImagePlugin.py	4.53 KB	-rw-r--r--
XbmImagePlugin.py	2.37 KB	-rw-r--r--
XpmImagePlugin.py	2.99 KB	-rw-r--r--
XVThumbImagePlugin.py	1.89 KB	-rw-r--r--

Code Editor : JpegPresets.py

"""
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

"""

# fmt: off
presets = {
            'web_low':      {'subsampling':  2,  # "4:2:0"
                             'quantization': [
                               [20, 16, 25, 39, 50, 46, 62, 68,
                                16, 18, 23, 38, 38, 53, 65, 68,
                                25, 23, 31, 38, 53, 65, 68, 68,
                                39, 38, 38, 53, 65, 68, 68, 68,
                                50, 38, 53, 65, 68, 68, 68, 68,
                                46, 53, 65, 68, 68, 68, 68, 68,
                                62, 65, 68, 68, 68, 68, 68, 68,
                                68, 68, 68, 68, 68, 68, 68, 68],
                               [21, 25, 32, 38, 54, 68, 68, 68,
                                25, 28, 24, 38, 54, 68, 68, 68,
                                32, 24, 32, 43, 66, 68, 68, 68,
                                38, 38, 43, 53, 68, 68, 68, 68,
                                54, 54, 66, 68, 68, 68, 68, 68,
                                68, 68, 68, 68, 68, 68, 68, 68,
                                68, 68, 68, 68, 68, 68, 68, 68,
                                68, 68, 68, 68, 68, 68, 68, 68]
                              ]},
            'web_medium':   {'subsampling':  2,  # "4:2:0"
                             'quantization': [
                               [16, 11, 11, 16, 23, 27, 31, 30,
                                11, 12, 12, 15, 20, 23, 23, 30,
                                11, 12, 13, 16, 23, 26, 35, 47,
                                16, 15, 16, 23, 26, 37, 47, 64,
                                23, 20, 23, 26, 39, 51, 64, 64,
                                27, 23, 26, 37, 51, 64, 64, 64,
                                31, 23, 35, 47, 64, 64, 64, 64,
                                30, 30, 47, 64, 64, 64, 64, 64],
                               [17, 15, 17, 21, 20, 26, 38, 48,
                                15, 19, 18, 17, 20, 26, 35, 43,
                                17, 18, 20, 22, 26, 30, 46, 53,
                                21, 17, 22, 28, 30, 39, 53, 64,
                                20, 20, 26, 30, 39, 48, 64, 64,
                                26, 26, 30, 39, 48, 63, 64, 64,
                                38, 35, 46, 53, 64, 64, 64, 64,
                                48, 43, 53, 64, 64, 64, 64, 64]
                             ]},
            'web_high':     {'subsampling':  0,  # "4:4:4"
                             'quantization': [
                               [6,   4,  4,  6,  9, 11, 12, 16,
                                4,   5,  5,  6,  8, 10, 12, 12,
                                4,   5,  5,  6, 10, 12, 14, 19,
                                6,   6,  6, 11, 12, 15, 19, 28,
                                9,   8, 10, 12, 16, 20, 27, 31,
                                11, 10, 12, 15, 20, 27, 31, 31,
                                12, 12, 14, 19, 27, 31, 31, 31,
                                16, 12, 19, 28, 31, 31, 31, 31],
                               [7,   7, 13, 24, 26, 31, 31, 31,
                                7,  12, 16, 21, 31, 31, 31, 31,
                                13, 16, 17, 31, 31, 31, 31, 31,
                                24, 21, 31, 31, 31, 31, 31, 31,
                                26, 31, 31, 31, 31, 31, 31, 31,
                                31, 31, 31, 31, 31, 31, 31, 31,
                                31, 31, 31, 31, 31, 31, 31, 31,
                                31, 31, 31, 31, 31, 31, 31, 31]
                             ]},
            'web_very_high': {'subsampling':  0,  # "4:4:4"
                              'quantization': [
                               [2,   2,  2,  2,  3,  4,  5,  6,
                                2,   2,  2,  2,  3,  4,  5,  6,
                                2,   2,  2,  2,  4,  5,  7,  9,
                                2,   2,  2,  4,  5,  7,  9, 12,
                                3,   3,  4,  5,  8, 10, 12, 12,
                                4,   4,  5,  7, 10, 12, 12, 12,
                                5,   5,  7,  9, 12, 12, 12, 12,
                                6,   6,  9, 12, 12, 12, 12, 12],
                               [3,   3,  5,  9, 13, 15, 15, 15,
                                3,   4,  6, 11, 14, 12, 12, 12,
                                5,   6,  9, 14, 12, 12, 12, 12,
                                9,  11, 14, 12, 12, 12, 12, 12,
                                13, 14, 12, 12, 12, 12, 12, 12,
                                15, 12, 12, 12, 12, 12, 12, 12,
                                15, 12, 12, 12, 12, 12, 12, 12,
                                15, 12, 12, 12, 12, 12, 12, 12]
                              ]},
            'web_maximum':  {'subsampling':  0,  # "4:4:4"
                             'quantization': [
                                [1,  1,  1,  1,  1,  1,  1,  1,
                                 1,  1,  1,  1,  1,  1,  1,  1,
                                 1,  1,  1,  1,  1,  1,  1,  2,
                                 1,  1,  1,  1,  1,  1,  2,  2,
                                 1,  1,  1,  1,  1,  2,  2,  3,
                                 1,  1,  1,  1,  2,  2,  3,  3,
                                 1,  1,  1,  2,  2,  3,  3,  3,
                                 1,  1,  2,  2,  3,  3,  3,  3],
                                [1,  1,  1,  2,  2,  3,  3,  3,
                                 1,  1,  1,  2,  3,  3,  3,  3,
                                 1,  1,  1,  3,  3,  3,  3,  3,
                                 2,  2,  3,  3,  3,  3,  3,  3,
                                 2,  3,  3,  3,  3,  3,  3,  3,
                                 3,  3,  3,  3,  3,  3,  3,  3,
                                 3,  3,  3,  3,  3,  3,  3,  3,
                                 3,  3,  3,  3,  3,  3,  3,  3]
                             ]},
            'low':          {'subsampling':  2,  # "4:2:0"
                             'quantization': [
                               [18, 14, 14, 21, 30, 35, 34, 17,
                                14, 16, 16, 19, 26, 23, 12, 12,
                                14, 16, 17, 21, 23, 12, 12, 12,
                                21, 19, 21, 23, 12, 12, 12, 12,
                                30, 26, 23, 12, 12, 12, 12, 12,
                                35, 23, 12, 12, 12, 12, 12, 12,
                                34, 12, 12, 12, 12, 12, 12, 12,
                                17, 12, 12, 12, 12, 12, 12, 12],
                               [20, 19, 22, 27, 20, 20, 17, 17,
                                19, 25, 23, 14, 14, 12, 12, 12,
                                22, 23, 14, 14, 12, 12, 12, 12,
                                27, 14, 14, 12, 12, 12, 12, 12,
                                20, 14, 12, 12, 12, 12, 12, 12,
                                20, 12, 12, 12, 12, 12, 12, 12,
                                17, 12, 12, 12, 12, 12, 12, 12,
                                17, 12, 12, 12, 12, 12, 12, 12]
                             ]},
            'medium':       {'subsampling':  2,  # "4:2:0"
                             'quantization': [
                               [12,  8,  8, 12, 17, 21, 24, 17,
                                8,   9,  9, 11, 15, 19, 12, 12,
                                8,   9, 10, 12, 19, 12, 12, 12,
                                12, 11, 12, 21, 12, 12, 12, 12,
                                17, 15, 19, 12, 12, 12, 12, 12,
                                21, 19, 12, 12, 12, 12, 12, 12,
                                24, 12, 12, 12, 12, 12, 12, 12,
                                17, 12, 12, 12, 12, 12, 12, 12],
                               [13, 11, 13, 16, 20, 20, 17, 17,
                                11, 14, 14, 14, 14, 12, 12, 12,
                                13, 14, 14, 14, 12, 12, 12, 12,
                                16, 14, 14, 12, 12, 12, 12, 12,
                                20, 14, 12, 12, 12, 12, 12, 12,
                                20, 12, 12, 12, 12, 12, 12, 12,
                                17, 12, 12, 12, 12, 12, 12, 12,
                                17, 12, 12, 12, 12, 12, 12, 12]
                             ]},
            'high':         {'subsampling':  0,  # "4:4:4"
                             'quantization': [
                               [6,   4,  4,  6,  9, 11, 12, 16,
                                4,   5,  5,  6,  8, 10, 12, 12,
                                4,   5,  5,  6, 10, 12, 12, 12,
                                6,   6,  6, 11, 12, 12, 12, 12,
                                9,   8, 10, 12, 12, 12, 12, 12,
                                11, 10, 12, 12, 12, 12, 12, 12,
                                12, 12, 12, 12, 12, 12, 12, 12,
                                16, 12, 12, 12, 12, 12, 12, 12],
                               [7,   7, 13, 24, 20, 20, 17, 17,
                                7,  12, 16, 14, 14, 12, 12, 12,
                                13, 16, 14, 14, 12, 12, 12, 12,
                                24, 14, 14, 12, 12, 12, 12, 12,
                                20, 14, 12, 12, 12, 12, 12, 12,
                                20, 12, 12, 12, 12, 12, 12, 12,
                                17, 12, 12, 12, 12, 12, 12, 12,
                                17, 12, 12, 12, 12, 12, 12, 12]
                             ]},
            'maximum':      {'subsampling':  0,  # "4:4:4"
                             'quantization': [
                               [2,   2,  2,  2,  3,  4,  5,  6,
                                2,   2,  2,  2,  3,  4,  5,  6,
                                2,   2,  2,  2,  4,  5,  7,  9,
                                2,   2,  2,  4,  5,  7,  9, 12,
                                3,   3,  4,  5,  8, 10, 12, 12,
                                4,   4,  5,  7, 10, 12, 12, 12,
                                5,   5,  7,  9, 12, 12, 12, 12,
                                6,   6,  9, 12, 12, 12, 12, 12],
                               [3,   3,  5,  9, 13, 15, 15, 15,
                                3,   4,  6, 10, 14, 12, 12, 12,
                                5,   6,  9, 14, 12, 12, 12, 12,
                                9,  10, 14, 12, 12, 12, 12, 12,
                                13, 14, 12, 12, 12, 12, 12, 12,
                                15, 12, 12, 12, 12, 12, 12, 12,
                                15, 12, 12, 12, 12, 12, 12, 12,
                                15, 12, 12, 12, 12, 12, 12, 12]
                             ]},
}
# fmt: on

${this.title}

Code Editor : JpegPresets.py