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|
Special Effects (FX)
====================
..
This document covers methods defined in MagickCore's fx.c file.
https://imagemagick.org/api/MagickCore/fx_8c.html
.. _noise:
Add Noise
---------
.. versionadded:: 0.5.3
You can add random noise to an image. This operation can be useful when applied
before a blur operation to defuse an image. The types of noise can be any
of the following.
- ``'gaussian'``
- ``'impulse'``
- ``'laplacian'``
- ``'multiplicative_gaussian'``
- ``'poisson'``
- ``'random'``
- ``'uniform'``
The amount of noise can be adjusted by passing an `attenuate` kwarg where the
value can be between `0.0` and `1.0`.
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.noise("laplacian", attenuate=1.0)
img.save(filename="fx-noise.jpg")
+-------------------------------------+------------------------------------+
| Original | Noise |
+-------------------------------------+------------------------------------+
| .. image:: ../_images/inca_tern.jpg | .. image:: ../_images/fx-noise.jpg |
| :alt: Original | :alt: Noise |
+-------------------------------------+------------------------------------+
.. _blue_shift:
Blue Shift
----------
.. versionadded:: 0.5.3
Gently mutes colors by shifting blue values by a factor. This produces a
nighttime scene with a moonlight effect.
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.blue_shift(factor=1.25)
img.save(filename="fx-blue-shift.jpg")
+-----------------------------+---------------------------------+
| Original | Blue Shift |
+-----------------------------+---------------------------------+
| .. image:: | .. image:: |
| ../_images/inca_tern.jpg | ../_images/fx-blue-shift.jpg |
| :alt: Original | :alt: Blue Shift |
+-----------------------------+---------------------------------+
.. _charcoal:
Charcoal
--------
.. versionadded:: 0.5.3
One of the artistic simulations, :meth:`~wand.image.BaseImage.charcoal()`
can emulate a drawing on paper.
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.charcoal(radius=1.5, sigma=0.5)
img.save(filename="fx-charcoal.jpg")
+-------------------------------------+---------------------------------------+
| Original | Charcoal |
+-------------------------------------+---------------------------------------+
| .. image:: ../_images/inca_tern.jpg | .. image:: ../_images/fx-charcoal.jpg |
| :alt: Original | :alt: Charcoal |
+-------------------------------------+---------------------------------------+
.. _color_matrix:
Color Matrix
------------
.. versionadded:: 0.5.3
This method allows you to recalculate color values by applying a matrix
transform. A matrix can be up to a 6x6 grid where each column maps to
a color channel to reference, and each row represents a color channel
to effect. Usually ``red``, ``green``, ``blue``, ``n/a``, ``alpha``,
and a constant (a.k.a offset) for RGB images, or ``cyan``, ``yellow``,
``magenta``, ``black``, ``alpha``, and a constant for CMYK images.
For example: To swap Red & Blue channels.
.. math::
\begin{aligned}
red' &= 0.0 * red + 0.0 * green + 1.0 * blue\\
green' &= 0.0 * red + 1.0 * green + 0.0 * blue\\
blue' &= 1.0 * red + 0.0 * green + 0.0 * blue\\
\end{aligned}
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
matrix = [[0, 0, 1],
[0, 1, 0],
[1, 0, 0]]
img.color_matrix(matrix)
img.save(filename="fx-color-matrix.jpg")
+-----------------------------+-----------------------------------+
| Original | Color Matrix |
+-----------------------------+-----------------------------------+
| .. image:: | .. image:: |
| ../_images/inca_tern.jpg | ../_images/fx-color-matrix.jpg |
| :alt: Original | :alt: Color Matrix |
+-----------------------------+-----------------------------------+
.. _colorize:
Colorize
--------
.. versionadded:: 0.5.3
Blends an image with a constant color. With
:meth:`Image.colorize() <wand.image.BaseImage.colorize>`, the ``color``
parameter is the constant color to blend, and the ``alpha`` is a mask-color
to control the blend rate per color channel.
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.colorize(color="yellow", alpha="rgb(10%, 0%, 20%)")
img.save(filename="fx-colorize.jpg")
+-------------------------------------+---------------------------------------+
| Original | Colorize |
+-------------------------------------+---------------------------------------+
| .. image:: ../_images/inca_tern.jpg | .. image:: ../_images/fx-colorize.jpg |
| :alt: Original | :alt: Colorize |
+-------------------------------------+---------------------------------------+
.. _fx:
FX
--
.. versionadded:: 0.4.1
`FX special effects`__ are a powerful "micro" language to work with.
Simple functions & operators offer a unique way to access & manipulate image
data. The :meth:`~wand.image.BaseImage.fx()` method applies a FX expression,
and generates a new :class:`~wand.image.Image` instance.
__ http://www.imagemagick.org/script/fx.php
We can create a custom DIY filter that will turn the image black & white,
except colors with a hue above 324°, or below 36°.
.. code-block:: python
from wand.image import Image
fx_filter="(hue > 0.9 || hue < 0.1) ? u : lightness"
with Image(filename="inca_tern.jpg") as img:
with img.fx(fx_filter) as filtered_img:
filtered_img.save(filename="fx-fx.jpg")
+-------------------------------------+---------------------------------+
| Original | FX |
+-------------------------------------+---------------------------------+
| .. image:: ../_images/inca_tern.jpg | .. image:: ../_images/fx-fx.jpg |
| :alt: Original | :alt: FX |
+-------------------------------------+---------------------------------+
.. _implode:
Implode
-------
.. versionadded:: 0.5.2
This special effect "pulls" pixels into the middle of the image. The ``amount``
argument controls the range of pixels to pull towards the center. With
ImageMagick 7, you can define the pixel interpolate methods. See
:const:`~wand.image.PIXEL_INTERPOLATE_METHODS`.
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.implode(amount=0.35)
img.save(filename="fx-implode.jpg")
+-------------------------------------+--------------------------------------+
| Original | Implode |
+-------------------------------------+--------------------------------------+
| .. image:: ../_images/inca_tern.jpg | .. image:: ../_images/fx-implode.jpg |
| :alt: Original | :alt: Implode |
+-------------------------------------+--------------------------------------+
.. _polaroid:
Polaroid
--------
.. versionadded:: 0.5.4
Wraps am image in a white board, and a slight shadow to create the special
effect of a Polaroid print.
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.polaroid()
img.save(filename="fx-polaroid.jpg")
+-------------------------------------+---------------------------------------+
| Original | Polaroid |
+-------------------------------------+---------------------------------------+
| .. image:: ../_images/inca_tern.jpg | .. image:: ../_images/fx-polaroid.jpg |
| :alt: Original | :alt: Polaroid |
+-------------------------------------+---------------------------------------+
.. _sepia_tone:
Sepia Tone
----------
.. versionadded:: 0.5.7
We can simulate old-style silver based chemical photography printing by
applying sepia toning to images.
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.sepia_tone(threshold=0.8)
img.save(filename="fx-sepia-tone.jpg")
+-----------------------------+---------------------------------+
| Original | Sepia Tone |
+-----------------------------+---------------------------------+
| .. image:: | .. image:: |
| ../_images/inca_tern.jpg | ../_images/fx-sepia-tone.jpg |
| :alt: Original | :alt: Sepia Tone |
+-----------------------------+---------------------------------+
.. _sketch:
Sketch
------
.. versionadded:: 0.5.3
Simulates an artist sketch drawing. Also see :ref:`charcoal`.
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.transform_colorspace("gray")
img.sketch(0.5, 0.0, 98.0)
img.save(filename="fx-sketch.jpg")
+-------------------------------------+-------------------------------------+
| Original | Sketch |
+-------------------------------------+-------------------------------------+
| .. image:: ../_images/inca_tern.jpg | .. image:: ../_images/fx-sketch.jpg |
| :alt: Original | :alt: Sketch |
+-------------------------------------+-------------------------------------+
.. _solarize:
Solarize
--------
.. versionadded:: 0.5.3
Creates a "burned" effect on the image by replacing pixel values above a
defined threshold with a negated value.
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.solarize(threshold=0.5 * img.quantum_range)
img.save(filename="fx-solarize.jpg")
+-------------------------------------+---------------------------------------+
| Original | Solarize |
+-------------------------------------+---------------------------------------+
| .. image:: ../_images/inca_tern.jpg | .. image:: ../_images/fx-solarize.jpg |
| :alt: Original | :alt: Solarize |
+-------------------------------------+---------------------------------------+
.. _stereogram:
Stereogram
----------
.. versionadded:: 0.5.4
Also known as "`anaglyph`_", this class method takes two
:class:`~wand.image.Image` instances (one for each eye), and creates a 3d
image by separating the Red & Cyan.
.. _anaglyph: https://en.wikipedia.org/wiki/Anaglyph_3D
.. code-block:: python
from wand.image import Image
with Image(filename="left_camera.jpg") as left_eye:
with Image(filename="right_camera.jpg") as right_eye:
with Image.stereogram(left=left_eye,
right=right_eye) as img:
img.save(filename="fx-stereogram.jpg")
+-----------------------------------------+
| Stereogram |
+-----------------------------------------+
| .. image:: ../_images/fx-stereogram.jpg |
| :alt: Stereogram |
+-----------------------------------------+
.. _swirl:
Swirl
-----
.. versionadded:: 0.5.7
Creates a visual whirlpool effect by rotating pixels around the center of the
image. The value of ``degree`` controls the amount, and distance, of pixels to
rotate around the center. Negative degrees move pixels clockwise, and positive
values move pixels counter-clockwise.
.. code-block:: python
from wand.image import Image
with Image(filename='inca_tern.jpg') as img:
img.swirl(degree=-90)
img.save(filename='fx-swirl.jpg')
+-------------------------------------+------------------------------------+
| Original | Swirl |
+-------------------------------------+------------------------------------+
| .. image:: ../_images/inca_tern.jpg | .. image:: ../_images/fx-swirl.jpg |
| :alt: Original | :alt: Swirl |
+-------------------------------------+------------------------------------+
.. _tint:
Tint
----
.. versionadded:: 0.5.3
Tint colorizes midtones of an image by blending the given ``color``.
The ``alpha`` parameter controls how the blend is effected between color
channels. However, this can be tricky to use, so when in doubt, use a
``alpha="gray(50)"`` argument.
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.tint(color="yellow", alpha="rgb(40%, 60%, 80%)")
img.save(filename="fx-tint.jpg")
+-------------------------------------+-----------------------------------+
| Original | Tint |
+-------------------------------------+-----------------------------------+
| .. image:: ../_images/inca_tern.jpg | .. image:: ../_images/fx-tint.jpg |
| :alt: Original | :alt: Tint |
+-------------------------------------+-----------------------------------+
.. _vignette:
Vignette
--------
.. versionadded:: 0.5.2
Creates a soft & blurry ellipse on the image. Use the ``x`` & ``y`` arguments
to control edge of the ellipse inset from the image border, and ``radius``
& ``sigma`` argument to control the blurriness. The ``radius`` can be omitted
if you wish ImageMagick to select a value from the defined ``sigma`` value.
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.vignette(sigma=3, x=10, y=10)
img.save(filename="fx-vignette.jpg")
+-------------------------------------+---------------------------------------+
| Original | Vignette |
+-------------------------------------+---------------------------------------+
| .. image:: ../_images/inca_tern.jpg | .. image:: ../_images/fx-vignette.jpg |
| :alt: Original | :alt: Vignette |
+-------------------------------------+---------------------------------------+
.. _wave:
Wave
----
.. versionadded:: 0.5.2
Creates a ripple effect within the image. With ImageMagick 7, you can define
the pixel interpolate methods. See
:const:`~wand.image.PIXEL_INTERPOLATE_METHODS`.
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.wave(amplitude=img.height / 32,
wave_length=img.width / 4)
img.save(filename="fx-wave.jpg")
+-------------------------------------+-----------------------------------+
| Original | Wave |
+-------------------------------------+-----------------------------------+
| .. image:: ../_images/inca_tern.jpg | .. image:: ../_images/fx-wave.jpg |
| :alt: Original | :alt: Wave |
+-------------------------------------+-----------------------------------+
.. _wavelet_denoise:
Wavelet Denoise
---------------
.. versionadded:: 0.5.5
This method removes noise by applying a `wavelet transform`_. The ``threshold``
argument should be a value between ``0.0`` &
:attr:`~wand.image.BaseImage.quantum_range`, and the ``softness`` argument
should be a value between ``0.0`` & ``1.0``.
.. _`wavelet transform`: https://en.wikipedia.org/wiki/Wavelet_transform
.. code-block:: python
from wand.image import Image
with Image(filename="inca_tern.jpg") as img:
img.wavelet_denoise(threshold=0.05 * img.quantum_range,
softness=0.0)
img.save(filename="fx-wavelet-denoise.jpg")
+-----------------------------+--------------------------------------+
| Original | Wavelet Denoise |
+-----------------------------+--------------------------------------+
| .. image:: | .. image:: |
| ../_images/inca_tern.jpg | ../_images/fx-wavelet-denoise.jpg |
| :alt: Original | :alt: Wavelet Denoise |
+-----------------------------+--------------------------------------+
|
