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.