Instructions

(last update :  07/02/2003)

& Didier Leboutte

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Comparative corrections

Note: I thank Alain Hamblenne for giving me permission to present his photographs here.

When the image on the left is more luminous than the image of right-hand side, the resulting anaglyph inclines toward the red (or toward cyan if darker) and flashes. To compensate for this, it is possible to make a global rebalancing of left/right luminosity .

But, when the variation of light intensity is caused by a detail in the image, this global rebalancing does not work anymore. As an example consider a window that passes external light in a big room. Between the 2 photoshots a cloud passes... Result: the anaglyph flashes on the zone lit by the window, and only there.

Example:
Left
The external light which enters by the windows of the small room,
and that by the ceiling windows, are important.
right-hand side
The amount of external light which enters by the windows of the small room,
and that by the ceiling windows, less important, and reveal zones previously in the shadow.
Anaglyph
The color of the image inclines toward red and flashes in the small room, on the wall in front of the camera,
on the large skeletons, and the tiles of the large room.
It inclines toward cyan in the windows, on the reflections of the tables,
and the tiles on the left.

The comparative correction evaluates the luminosity in each point of the image, compares the 2 sights, carries out the correction... and hop, bingo!

Après correction
All the elements find their colors of origin.
There remains a light tan around the large bones on the left,
and a light blur on the large bone on the right because of the important shift.

To get good result with this comparative correction, it is necessary to carry out the correction on images that have already been treated as described before.

It is a little bit havy to compute, and lets some defects, but sometimes the only solution to the luninosity problems is to consid them when shooting pictures...

Drawing functions

Click on the box "Pix".

To paint with the brush
It is the default mode.

To insert text
When inserting text, the brush mode is disactivated as long as the text input field contains data.
Using image-brushes
When using image-brushes, the brush mode is disactivated as long as image-brushes exist.
When you use the image-brush, it is not possible to change the dimension of image-brush. On the other hand, it is possible to change the dimension of the image you are working with, giving the same result.

Extraction of objects

Click on the tool "Saws" If you want to be able to use the function of transparency to insert the object in another scene, save it in BMP format. (thus avoiding artifacts resulting from JPG compression).

The background of the images thus generated is black. To use the function of transparency of brushimages, you have to enter these values (R=0, V=0, B=0) in the colorbox, because the default color is the white (R=255, V=255, B=255).

It is possible of redifine the dimensions of the extracted left and right images to be able to insert them elsewhere in other proportions.


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