imagefilter() applies the given filter
filtertype
on the image
.
image
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
filtertype
filtertype
can be one of the following:
IMG_FILTER_NEGATE
: Reverses all colors of
the image.
IMG_FILTER_GRAYSCALE
: Converts the image into
grayscale.
IMG_FILTER_BRIGHTNESS
: Changes the brightness
of the image. Use arg1
to set the level of
brightness.
IMG_FILTER_CONTRAST
: Changes the contrast of
the image. Use arg1
to set the level of
contrast.
IMG_FILTER_COLORIZE
: Like
IMG_FILTER_GRAYSCALE
, except you can specify the
color. Use arg1
, arg2
and
arg3
in the form of
red
, blue
,
green
. The range for each color is 0 to 255.
IMG_FILTER_EDGEDETECT
: Uses edge detection to
highlight the edges in the image.
IMG_FILTER_EMBOSS
: Embosses the image.
IMG_FILTER_GAUSSIAN_BLUR
: Blurs the image using
the Gaussian method.
IMG_FILTER_SELECTIVE_BLUR
: Blurs the image.
IMG_FILTER_MEAN_REMOVAL
: Uses mean removal to
achieve a "sketchy" effect.
IMG_FILTER_SMOOTH
: Makes the image smoother.
Use arg1
to set the level of smoothness.
arg1
arg2
arg3