Ximagic Photoshop plugins
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Usage

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The plugin accept RGB color and grayscale images.

The RGB color images are converted automatically to grayscale using Y of YCbCr colorspace

Output gray levels The grayscale image can be converted to n-level grayscale, the 2 level grayscale is a B/W bitmap
Ordered dithering is the first step. It is not quantization error dependent as is the error dithering step. It can be used with or without further quantization.
  • Levels x Channel: The ordered quantization filter reduces levels of color of each channel. Each value can be from 2 to 256. When 256 is selected, the result is the same image
  • Ordered
    • Pattern: Select one from the values. There are diffusion and halftone patterns.
  • Ordered user defined
    • Pattern: Select one of the values.
    • Load Button to load an user threshold pattern from a file. The file must have the format explained in the user Threshold pattern (below).
    • Delete Button to delete the selected user threshold pattern
  • Calculated
    • Shape Circle
    • W Horizontal distance between center of shapes
    • H Vertical distance between center of shapes
  • Random
Error Dithering is the third step and it can be selected only if Quantization is selected. There are two main methods, arrays and space filling curve
  • % Error propagation Value of error diffused default 100%.
  • Array
    • Methods
      • Floyd-Steinberg
      • Ulichney
      • Fan
      • Jarvis
      • Stucki
      • Sierra3
      • Sierra2
      • Sierra42A
    • Serpentine scan Select serpentine scan of image.
  • Space filling curve
    • Methods
      • Riemersma
    • Queue size Number of pixels remembered
Postprocessing DBS (Direct binary search) This is a experimental feature and applicable only on bilevel images. After a transformation, the algorithm compares the initial image with the transformed one and try to adjust the final one, analyzing each pixel and its surroundings.



user_threshold

User Threshold pattern

User Threshold patterns can be loaded from files with the appropriate format or from images.
After a pattern is loaded it remain stored until the user deletes it.
The maximum pattern size is 262144 (width*height)

To load from a file
  • The file format should be:

    [width] [height]
    [matrix row 1 values separated by blanks]
    [matrix row 2 values separated by blanks]
    ...
    [matrix row n values separated by blanks]
    An example file
  • Method
    • Start Ximagic Quantizer and push the load button in the user threshold line
    • In the load dialog fill the pattern name, select "from file", fill the file name and push the ok button
To load from an image
  • The 1st channel of the current transformed image in the plugin will be imported as a threshold matrix
    Image of the pattern Diffusion 8x8
    Image of the pattern Halftone orthogonal 8x8
  • Method:
    • Open the threshold image in the editor.
    • Start Ximagic Quantizer.
    • Push the Load button in the user threshold line
    • In the load dialog, fill the pattern name, select from image, and push ok button.
    • When the image is loaded, a message box with the width and height of the pattern will appear.
    • The plugin will end. The image selected in the editor is the threshold and the plugin should end to allow the user to select another image.