Analyze (6th, Nov., 1999)

Description

This is the version 1.0 of the Analyze plug-in. It gives a closer view to the quality of the digital images from scanners and digicams.

So far it contains two modes that both looks by a 3x3 kernel for a flat image areas. Here flat means areas that have no detail or only a little detail.
 
The plug-in show the flat areas by inverting the image data at those areas, this makes them easily detectable.

Selection Dropdown

RGB flat to inverse looks at the RGB composite channel and inverts those pixels that are in the flat area. 

Channel flat to inverse looks at each color channel separately and it invert them separately when flat area is detected. This naturally gives more information than the RGB flat to inverse.

Sliders

Neighbors: The range is 1 to 8 with default setting at 8. This number of neighbors has to be flat (compared to the center pixel) in order the center pixel to be inverted. 
 
Difference: The range is 0 to 32 with default setting at 0. This is the flatness. 0 means that the that the matching neighbor has to be exactly the same as the center pixel in order to be doomed to be flat. 1 means that there can be +/- level difference and so on.  It is better to keep it at 0 or 1.

Notes

This filter is not affected by the image-gamma since it only compares the levels.

Images from Canon eos*cds*3 digital camera are not affected much if at all by Neighbors=1 and Difference=0. This tells that there are a lot of invisible image information in the image so these images can be edited well. 

Images from Olympus 400z digicam are inverted completely at Neighbors=3 and Difference=0 and they are strongly affected by Neighbors=4 and Difference=0. This tells that there is not much invisible image information in the image.  Olympus 400z is good in that there usually are not very large flat areas. 

First thing to do when the filter opens is to Shift-Click the preview + button in order to have the 1:1 zoom in the preview box.  Then drag the image so that a representative area is shown, the dragging is not limited to the preview box boundaries. It is often very necessary to have the 1:1 zoom ratio in the preview box in order to see the result of this filter correctly.

Author

Timo Autiokari. Homepage: Accurate Image Manipulation for Desktops

Usage and Distribution Rights

Free to download and use, distribution prohibited.

Filter Engine

FilterFormula v 1.1, by ATS/Graphics