Color Manipulation
Saturation
Parameter: saturation
Units: Number
Range: -100 to 100
Default: 0
Change color saturation of the image. Negative values reduce saturation, while positive values increase it.
Examples:
?saturation=-100(grayscale)?saturation=-25(reduced saturation)?saturation=0(original)?saturation=25(increased saturation)
Hue
Parameter: hue
Units: Number
Range: 0 to 100
Default: 0
Adjusts the colors of the image by rotating the color wheel. The default value of 0 is the base color, and increasing the value modulates to the next color for every 33 change.
Examples:
?hue=0(original)?hue=33(first color shift)?hue=66(second color shift)?hue=90(third color shift)
Contrast
Parameter: contrast
Units: Number
Range: -100 to 100
Default: 0
Adjusts the contrast of the output image. Positive values increase contrast, while negative values decrease it.
Examples:
?contrast=0(original)?contrast=20(increased contrast)?contrast=-20(decreased contrast)
Tint
Parameter: tint
Units: Hex color code
Default: ffffff
Apply a tint over the image. The tint function is subtractive.
Examples:
?tint=aaffff(light blue tint)?tint=ffffaa(light yellow tint)?tint=ffaaff(light purple tint)
Sepia
Parameter: sepia
Units: Integer
Range: 0 to 100
Default: 0
Changes the image color to the sepia color scheme.
Examples:
?sepia=0(original)?sepia=50(partial sepia)?sepia=100(full sepia)