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Enhancement – Invert
Invert turns black to white, and white to black.
How the values change
| Image type | Output |
|---|---|
| 8-bit integer | 255 − value |
| 16-bit integer | 65535 − value |
| 32-bit integer | 4294967295 − value |
| floating point | −value |
For example, in an 8-bit image a dark gray of 35 becomes a light gray of 220, and black (0) becomes white (255). In a floating-point image, 0.5678 becomes −0.5678.
Choosing bands
By default, all bands are inverted. Select some to choose the bands, and list their numbers separated by spaces or semicolons (;).
For example, to invert only the red and blue bands of an RGB color image, enter 0;2 (band 0 is red, 1 is green and 2 is blue). In a 19-band floating-point PCA image, 1;3;6;8 inverts only those four bands; all 19 bands are still passed on.
Inverting part of an image
If you enter a “window”, only the part of the image inside it is inverted. Otherwise the whole image is inverted. See Window Arguments.
Invert works on byte, integer or floating-point images, and the output is the same type as the input.