@@ -321,6 +321,10 @@ Consult an expert or scholar to ensure the orientation at this stage is correct.
## Align the reference image
### Using algorithmic registration
Using the [Landmark Picker GUI app](https://code.cs.uky.edu/seales-research/landmark-picker), generate a landmarks file which maps points in the reference photograph onto the same points in the texture image generated by the previous step.
- Load the texture image as the Fixed image and the reference photograph as the Moving image.
- Select 6+ point correspondences between these two images.
This can be useful if you wish to align an RGB photograph to the texture image, but surface details can only be seen in an alternative channel (i.e. infrared).
### Manual registration using Photoshop's Puppet Warp
- drag files into PS
- will consolidate into render layer (need to take other layers back to 8 bit later)
- rename render layer "texture"
- go to photo, duplicate into texture, rename it "photo"
- right click on that, convert to smart object (.psb)
- double click on it to open it in a new tab
- go to ink labels, duplicate into that new psb
- name that layer ink-labels or something useful
- toggle that layer's visibility by clicking eyeball
- save that psb with command+S
- close ink label and photo image so they are out of the way
- save the original tab as a ps file (.psd)
- select the psb layer and go to edit->puppet warp
- in puppet warp you set pins, you can move the pins and it moves the pixels accordingly
- can play with opacity in layers thing
- can play with transfer function (dropdown that says "normal") in layers thing
- can turn "show mesh" off at the top
- when done open up smart layer (.psb), turn on ink-label visibility, and save. (this controls the way in which the smart layer appears in the main .psd file)
- go back to the main (.psd) file and turn the visibility on for both "photo" and "texture" layers. (otherwise, as a result of puppet-warping, the "photo" layer may no longer be a perfect rectangle any more)
- still on the main (.psd) file, choose File->Save a Copy, choose PNG as the format and save.
- open the saved <inklabel>.png file in Photoshop, go to image->mode and change it to "grayscale" "8-bit".
- repeat the previous 4 steps with photo visibility turned on (and saved) in the smart layer (.psb)
- can re-enter puppet warp and make more changes if desired by double clicking "puppet warp" under smart filters in layers dialog
- might want to read up on puppet warp documentation
## Generate ink labels
Ink labels are black-and-white images which indicate those areas of the PPM which contain ink and those which do not.
They are manually created in Photoshop using the following steps:
