Constant Index
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G
 GD_BELL
 GD_BESSEL
 GD_BICUBIC
 GD_BICUBIC_FIXED
 GD_BILINEAR_FIXED
 GD_BLACKMAN
 GD_BOX
 GD_BSPLINE
 GD_CATMULLROM
 GD_CROP_BLACK
 GD_CROP_DEFAULT
 GD_CROP_SIDES
 GD_CROP_TRANSPARENT
 GD_CROP_WHITE
 GD_GAUSSIAN
 GD_GENERALIZED_CUBIC
 GD_HAMMING
 GD_HANNING
 GD_HERMITE
 GD_LINEAR
 GD_MITCHELL
 GD_NEAREST_NEIGHBOUR
 GD_POWER
 GD_QUADRATIC
 GD_QUANT_DEFAULT
 GD_QUANT_JQUANT
 GD_QUANT_LIQ
 GD_QUANT_NEUQUANT
 GD_SINC
 GD_TRIANGLE
 GD_WEIGHTED4
 gdAntiAliased
 gdBrushed
 gdCropMode
 gdDisposalNone
 gdDisposalRestoreBackground
 gdDisposalRestorePrevious
 gdDisposalUnknown
 gdHeifCodec
 gdHeifCompression
 gdImageGifAnim
 gdInterpolationMethod
 gdStyled
 gdStyledBrushed
 gdTiled
 gdTransparent
 gdWebpLossless
S
 Special Colors
Bell
Bessel
Bicubic
fixed point bicubic integer
fixed point bilinear
Blackman
Box
BSpline
Catmullrom
Crop black borders
Same as GD_CROP_TRANSPARENT
Crop using colors of the 4 corners
Crop using the transparent color
Crop white borders
Gaussian
Generalized cubic
Hamming
Hannig
Hermite
bilinear interpolation
Mitchell
Nearest neighbour interpolation
Power
Quadratic
GD_QUANT_LIQ if libimagequant is available, GD_QUANT_JQUANT otherwise.
libjpeg’s old median cut.
A combination of algorithms used in libimagequant aiming for the highest quality at cost of speed.
NeuQuant - approximation using Kohonen neural network.
Sinc
Triangle
4 pixels weighted bilinear interpolation
draw anti aliased
use the current brush, see gdImageSetBrush
Preserve previous frame
First allocated color of palette
Restore to before start of frame
Not recommended
GD_HEIF_CODEC_UNKNOWN GD_HEIF_CODEC_HEVC GD_HEIF_CODEC_AV1
GD_HEIF_CHROMA_420 GD_HEIF_CHROMA_422 GD_HEIF_CHROMA_444
use the current style, see gdImageSetStyle
use the current style and brush
use the current tile, see gdImageSetTile
indicate transparency, what is not the same as the transparent color index; used for lines only
Lossless quality threshold.
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