Developing Autochrome

The next step is to "develop" the panchromatic channel that gives detail to the image. The autochrome starch channels only act as filters. The real, detailed image is underlying. We have to make the autochrome filtering transparent in order to reproduce this technique of yesteryear.

1. Activate the Layers tab, then double click on Layer 1.
   
   
2. In the Blend If field in the Layer Options dialog box, move the sliding scale called This Layer until the greyscale image appears in the autochrome filters.
   
   
Measure the effect and visibility of the image with the naked eye.


3. Click on OK when you have finished.
   
   

The autochrome is finished. A few additional adjustments will no doubt be necessary, such as adjusting the contrast (Image > Adjust > Brightness/Contrast) or the colour mix (Image > Adjust > Colour Balance).



Figure 3: A digital autochrome.

When you have finished, select Layers > Flatten image. Now all you have to do is save your image and do what you want with it!