About Photogrey

The PhotoGrey plugin was created as a companion to the Sketcher plugin, providing colour filtering to create better illumination sources for Sketched images. It works like a colour filter in black and white photography, producing a greyscale image.

PhotoGrey has developed to provide useful imaging functions for traditional digital photography; unique greyscale gradient filtering and colour enhancement/suppression on colour images.

Using PhotoGrey

The image on the left shows the interface when the plugin is first run. There are three components to the interface. The top four choices allow the selection of a simple single-colour filter, a horizontal or vertical colour-gradient filter, or four separate colours for each corner.

Underneath these is the colour selection box. This will show one, two or four boxes depending on the type of gradient chosen. To change the colour of a box simply click it and a colour selector will appear.

The third component is a selector for whether you wish to preserve the colour in the image. By default this is off and the result is a greyscale "black and white photograph". When selected, the resultant image preserves the source images colours but adjusts different colour intensity based on the filter results.

 As example of the effect of the plugin, here is a source image and the results of filtering through different single colours.
 

Original picture

Normal "convert to grey/greyscale" result

PhotoGrey orange filter applied

 

PhotoGrey green filter applied

 

This image shows the interface with a four point gradient selected. There are four colour boxes as a result, three set to red and the fourth set to blue. The images below show the results of using PhotoGrey with 'Preserve Colour' selected. The last image illustrates the application of the four-point filter shown on the right.

 

Original picture
 

Blue filter : renders a dark,
low-key, atmospheric scene
 

Red filter : Similar in effect to a polarizng
filter, it accentuates the sunshine
and warm autumnal feel 

 

Four Point filter : Three red corners and blue in the bottom right, highlighting the left sunlit tree and pushing the right sunlit tree into shadow