This enumeration specifies types of interpolation used by ImageGear.
| IG_INTERPOLATION_NONE | No interpolation. |
| IG_INTERPOLATION_AVERAGE | Average interpolation. |
| IG_INTERPOLATION_BILINEAR | Bilinear interpolation. |
| IG_INTERPOLATION_NEAREST_NEIGHBOR | Nearest neighbor interpolation. |
| IG_INTERPOLATION_PADDING | Resize by adding padding to the image or by cropping the image (this is not an interpolation method). |
| IG_INTERPOLATION_GRAYSCALE | Scale to Gray interpolation method. It applies to bi-tonal images, and produces a 8-bit grayscale image as a result. |
| IG_INTERPOLATION_PRESERVE_WHITE | Preserve White interpolation method. |
| IG_INTERPOLATION_PRESERVE_BLACK | Preserve Black interpolation method. |
| IG_INTERPOLATION_BICUBIC | Bi-cubic interpolation method. |
| IG_INTERPOLATION_CANVAS | Same as IG_INTERPOLATION_PADDING. |