Dave's Saturation Map

Download

To insert this into your library, simply click on the 3-line 'hamburger' on the top right of the library panel, click on 'Import Macros...' and point it at the downloaded file. Then click on the layer for which you want a model and click once on the appropriate macro in the 'Saturation Map' library group category.

About

These are two macros that create a saturation map with the principle that saturation can be calculated, per pixel, as max(red,green,blue)-min(red,green,blue). This works on the principle that when all RGB are the same (so max-min is zero) the result is a monochrome pixel, and when it is maximum (100%), then one colour is 0 and another is 1, so max-min is 1.

Note that when the saturation map does not stretch from black to white this is because there is a limited saturation range within the image. You can compensate for this with Levels (or, in short-cut, Auto-levels).

The Macros start with a Merge Visible to start afresh from the visible image (allowing for non-destructive back-tracking) then use Apply Image to create the saturation map (note: this takes a long time to process). The resultant map may be used as you wish or can be copied to a spare channel in the Channels tab so you can add it to an existing adjustment or mask (right click, add to...).

Macros

Macros offered are:

Saturation Map: Creates a single layer saturation map, with lighter pixel indicating greater saturation.

Saturation Map + Stretch, Spare Channel and Bottom: Creates saturation map, then stretches the histogram with 'Auto levels', adds a Spare Channel of the map in Channels tab and moves the saturation map layer to the bottom of the stack.

Quick links

Saturation Map

Download

About

Macros

See also

Site Menu

You can buy books here

Quick links

Disciplines

Techniques

Principles

Explanations

Theories

And

Site Menu

Quick links

Disciplines

Techniques

Principles

Explanations

Theories

And