(PECL gmagick >= Unknown)
Gmagick::getimagecolors — Returns the color of the specified colormap index
Returns the color of the specified colormap index.
锟剿猴拷锟斤拷没锟叫诧拷锟斤拷锟斤拷
The number of colors in image.
锟斤拷锟斤拷时锟阶筹拷 GmagickException锟斤拷