Third and final page of my inversion tutorial, this one describing how to actually scan and invert the piece.
There are actually several ways you can perform an inversion (most of which require either Photoshop or GIMP), but my favorite method is the YUV inversion, which reverses the lights and darks without actually swapping each color for its complement, i.e. red is still red and green is still green.
Specific instructions on how to perform a YUV inversion:
In Adobe Photoshop: (must be full Photoshop, and not Elements)
- Open your scanned image.
- On the Image Menu, set its Mode to "Lab Color".
- Open up your Channels and select ONLY the Greyscale channel.
- Invert channel as you would a normal layer.
- Done! Convert your image back to RGB color mode.
In GIMP:
- Open your scanned image.
- "Decompose" the image into YUV layers. In GIMP 2.0, you can find this option under the 'Filters > Colors' menu; in GIMP 2.2 it is under the 'Image > Mode' menu.
- Select the grayscale, or "luma" layer.
- Invert the layer.
- Recompose the image back into RGB space (the "Compose" and "Decompose" commands are right next to each other). |
