Identifies the different image transition effects.
Values:
| IG_WIPE_LEFTTORIGHT | Left-to-Right Wipe. |
| IG_WIPE_RIGHTTOLEFT | Right-To-Left Wipe. |
| IG_WIPE_UP_TO_DOWN | Up-to-Down Wipe. |
| IG_WIPE_DOWN_TO_UP | Down-to-Up Wipe. |
| IG_WIPE_SPARKLE | Sparkle Transition. |
| IG_WIPE_ULTOLRDIAG | Upper Left to Lower Right wipe. |
| IG_WIPE_LRTOULDIAG | Lower Right to Upper Left wipe. |
| IG_WIPE_URTOLLDIAG | Upper Right to Lower Left wipe. |
| IG_WIPE_LLTOURDIAG | Lower Left to Upper Right wipe. |
| IG_WIPE_CLOCK | Clockwise wipe. |
| IG_WIPE_SPARKLE_CLOCK | Clockwise wipe with sparkles. |
| IG_WIPE_DOUBLE_CLOCK | Two simultaneous clockwise wipes, 180 grades apart. |
| IG_WIPE_SLIDE_RIGHT | New image slides in from the left. |
| IG_WIPE_SLIDE_LEFT | New image slides in from the right. |
| IG_WIPE_SLIDE_UP | New image slides in from the down. |
| IG_WIPE_SLIDE_DOWN | New image slides in from the up. |
| IG_WIPE_RANDOM_BARS_DOWN | Vertical bars of old image fall to reveal new image. |
| IG_WIPE_RAIN | Vertical lines of new image cover over old, like paint running down the side of a bucket. |
| IG_WIPE_BOOK | Book wipe. |
| IG_WIPE_ROLL | Old image rolls in from right to left. |
| IG_WIPE_UNROLL | New image rolls out from left to right. |
| IG_WIPE_EXPAND_PROPORTIONAL | New image expands from the center of old image in diagonal directions. |
| IG_WIPE_EXPAND_HORIZONTAL | New image expands from the center of old image in horizontal directions. |
| IG_WIPE_EXPAND_VERTICAL | New image expands from the center of old image in vertical directions. |
| IG_WIPE_STRIPS_HORIZONTAL | New image appears as expanding horizontal strips. |
| IG_WIPE_STRIPS_VERTICAL | New image appears as expanding vertical strips. |
| IG_WIPE_CELLS | New image appears as expanding square cells. |
| IG_WIPE_BALL | New image appears as tracks of spirally moving balls. |
| IG_WIPE_GEARS | New image appears as tracks of moving ImageGear's icons. |