1、Load：reads from disk the image in a specific format；
2、Save：saves to disk the image in a specific format；
3、Filter：2D linear filter(图像锐化，可提高图像清晰度)；
4、Copy：copies the image from an exsisting source；
5、Resample：resizes the image ；
6、Saturate：changes the saturation of the image(调整图像饱和度)；
7、GrayScale：图像灰度化；
8、Flip：图像上下翻动；
9、Mirror：图像左右翻动；
10、Negative：颜色取反(255-原值)；
11、Dither：converts the image to B&W using the desired method ；
12、Threshold：converts the image to B&W(二值化)；
13、AdaptiveThreshold：converts the image to B&W, using an optimal threshold mask(自适应阈值法)；
14、Colorize：replaces the original hue and saturation values；
15、Solarize：convert all colors above a given lightness level into their negative ；
16、Light：changes the brightness and the contrast of the image(图像亮度和对比度调整)；
17、Threshold2：filters only the pixels with a lightness less (or more) than the threshold level, and preserves the colors for the unfiltered pixels；
18、Dilate：enhance the light areas of the image；
19、Erode：enhance the dark areas of the image；
20、Contour：enhance the variations between adjacent pixels；similar results can be achieved using Filter(), but the algorithms are different both in Edge() and in Contour()；
21、Edge：enhance the variations between adjacent pixels(注意线性和非线性的区别)；similar results can be achieved using Filter(), but the algorithms are different both in Edge() and in Contour()；
22、Trace：finds the contour of an object with a given color；
23、Noise：adds an uniform noise to the image；
24、Jitter：adds a random offset to each pixel in the image；
25、Draw：draws the image in the specified device context, with support for alpha channel, alpha palette, transparency, opacity；
26、GetWidth：获得图像的宽带；
27、GetHeight：获得图像的高度；
28、GetXDPI：获得图像x轴分辨率(支持TIFF、JPEG、PNG、BMP格式)；
29、GetYDPI：获得图像y轴分辨率(支持TIFF、JPEG、PNG、BMP格式)；
30、IsValid：checks if the image is correctly initializated；
31、SetJpegQuality：set quality level for JPEG and JPEG2000；
32、GetJpegQuality：get quality level for JPEG and JPEG2000；
33、GetNumColors：returns 2, 16, 256; 0 for RGB images；
34、GetLastError：returns the last reported error；
35、SetPixelColor：设置像素颜色值；
