Using imagecopymerge to create a translucent watermark
gd_info
GD
PHP Manual
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gd_info
Retrieve information about the currently installed GD library
getimagesize
Get the size of an image
image_type_to_extension
Get file extension for image type
image_type_to_mime_type
Get Mime-Type for image-type returned by getimagesize, exif_read_data, exif_thumbnail, exif_imagetype
image2wbmp
Output image to browser or file
imagealphablending
Set the blending mode for an image
imageantialias
Should antialias functions be used or not
imagearc
Draws an arc
imagechar
Draw a character horizontally
imagecharup
Draw a character vertically
imagecolorallocate
Allocate a color for an image
imagecolorallocatealpha
Allocate a color for an image
imagecolorat
Get the index of the color of a pixel
imagecolorclosest
Get the index of the closest color to the specified color
imagecolorclosestalpha
Get the index of the closest color to the specified color + alpha
imagecolorclosesthwb
Get the index of the color which has the hue, white and blackness
imagecolordeallocate
De-allocate a color for an image
imagecolorexact
Get the index of the specified color
imagecolorexactalpha
Get the index of the specified color + alpha
imagecolormatch
Makes the colors of the palette version of an image more closely match the true color version
imagecolorresolve
Get the index of the specified color or its closest possible alternative
imagecolorresolvealpha
Get the index of the specified color + alpha or its closest possible alternative
imagecolorset
Set the color for the specified palette index
imagecolorsforindex
Get the colors for an index
imagecolorstotal
Find out the number of colors in an image's palette
imagecolortransparent
Define a color as transparent
imageconvolution
Apply a 3x3 convolution matrix, using coefficient and offset
imagecopy
Copy part of an image
imagecopymerge
Copy and merge part of an image
imagecopymergegray
Copy and merge part of an image with gray scale
imagecopyresampled
Copy and resize part of an image with resampling
imagecopyresized
Copy and resize part of an image
imagecreate
Create a new palette based image
imagecreatefromgd2
Create a new image from GD2 file or URL
imagecreatefromgd2part
Create a new image from a given part of GD2 file or URL
imagecreatefromgd
Create a new image from GD file or URL
imagecreatefromgif
Create a new image from file or URL
imagecreatefromjpeg
Create a new image from file or URL
imagecreatefrompng
Create a new image from file or URL
imagecreatefromstring
Create a new image from the image stream in the string
imagecreatefromwbmp
Create a new image from file or URL
imagecreatefromxbm
Create a new image from file or URL
imagecreatefromxpm
Create a new image from file or URL
imagecreatetruecolor
Create a new true color image
imagedashedline
Draw a dashed line
imagedestroy
Destroy an image
imageellipse
Draw an ellipse
imagefill
Flood fill
imagefilledarc
Draw a partial arc and fill it
imagefilledellipse
Draw a filled ellipse
imagefilledpolygon
Draw a filled polygon
imagefilledrectangle
Draw a filled rectangle
imagefilltoborder
Flood fill to specific color
imagefilter
Applies a filter to an image
imagefontheight
Get font height
imagefontwidth
Get font width
imageftbbox
Give the bounding box of a text using fonts via freetype2
imagefttext
Write text to the image using fonts using FreeType 2
imagegammacorrect
Apply a gamma correction to a GD image
imagegd2
Output GD2 image to browser or file
imagegd
Output GD image to browser or file
imagegif
Output image to browser or file
imagegrabscreen
Captures the whole screen
imagegrabwindow
Captures a window
imageinterlace
Enable or disable interlace
imageistruecolor
Finds whether an image is a truecolor image
imagejpeg
Output image to browser or file
imagelayereffect
Set the alpha blending flag to use the bundled libgd layering effects
imageline
Draw a line
imageloadfont
Load a new font
imagepalettecopy
Copy the palette from one image to another
imagepng
Output a PNG image to either the browser or a file
imagepolygon
Draws a polygon
imagepsbbox
Give the bounding box of a text rectangle using PostScript Type1 fonts
imagepsencodefont
Change the character encoding vector of a font
imagepsextendfont
Extend or condense a font
imagepsfreefont
Free memory used by a PostScript Type 1 font
imagepsloadfont
Load a PostScript Type 1 font from file
imagepsslantfont
Slant a font
imagepstext
Draws a text over an image using PostScript Type1 fonts
imagerectangle
Draw a rectangle
imagerotate
Rotate an image with a given angle
imagesavealpha
Set the flag to save full alpha channel information (as opposed to single-color transparency) when saving PNG images
imagesetbrush
Set the brush image for line drawing
imagesetpixel
Set a single pixel
imagesetstyle
Set the style for line drawing
imagesetthickness
Set the thickness for line drawing
imagesettile
Set the tile image for filling
imagestring
Draw a string horizontally
imagestringup
Draw a string vertically
imagesx
Get image width
imagesy
Get image height
imagetruecolortopalette
Convert a true color image to a palette image
imagettfbbox
Give the bounding box of a text using TrueType fonts
imagettftext
Write text to the image using TrueType fonts
imagetypes
Return the image types supported by this PHP build
imagewbmp
Output image to browser or file
imagexbm
Output XBM image to browser or file
iptcembed
Embed binary IPTC data into a JPEG image
iptcparse
Parse a binary IPTC block into single tags.
jpeg2wbmp
Convert JPEG image file to WBMP image file
png2wbmp
Convert PNG image file to WBMP image file
Using imagecopymerge to create a translucent watermark
gd_info
GD
PHP Manual