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16.64 - Add Images

Quick Reference to Scripting Command
a=ADD(MODE[0-3])
(0,1,2,3 = add & average,abs,abt/gry,as cloud)
Items in CAPS are 0/1 or ranges with more options than just 0/1.
Ranges other than 0/1 are indicated by brackets, such as [0-2].


Operation Example

The Add operation will add the specified source image into the action image. The entire source image will be scaled and added into the action image regardless of the area select. If the area select is too small or a non-symmetric shape, the source will be clipped at the edges of the area select. The image can be added directly or can be added absolutely.


Add Images Operation Dialog

16.64.1 - Add Images Controls

16.64.1.1 - Trends

Operator dialog controls that have a Trend button next to them offer animation functionality. Trend allows you to set that variable over a set of frames. Each frame of the animation can be thought of as a slice of time. The trends allow you to alter some, all, or none of the variables for a particular time slice. Variables that have multiple states can be set to any of a number of values in the trend. Variables that are either on or off can only have an on or off value in the trend. You will notice that the trend graphs have equidistantly spaced vertical lines. Each of these lines represents a frame in the animation. The number of frames can be altered using Sequence controls... in the TimeLine pull down menu. Animation lengths of 100 - 999 frames will be represented with a vertical bar being 10 frames, and animation length greater than 1000 frames will have a vertical bar for every 100 frames. Click here to view more information on Trends.

16.64.1.2 - Addition mode

  • Add and Average
    This option will add the two iamges together, and then divide the result by two.
  • Absolute Add
    This option will add the two images absolutely. An absolute add means that if each image has a middle gray pixel, in the same location, the result would be white.
  • Add About Gray
    This option will do a signed addition, with zero as middle grey and values extending up and down from there.
  • Cloud Insertion
    This option will perform a special thresholding process in order to combine the source image, which is presumed to be an image of cloud puffs againsts black, with the action image, which is presumed to be the colors of the sky from horizon to zenith.
     Tip:

    You can create a black-on-white cloud texture of just this type by using a black to white palette and the Texture Generator. Both the Fractal and 3d Noise generator classes make wonderful clouds. This procedure is useful for making sky textures of many kinds. The Texture generator can make sky textures that are in images whose sizes are powers of 2 (256x256, etc.) Using the Cloud Insertion mode allows you to have sky images that are any size you like.

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