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Image color reduction is the process of decreasing the number of distinct colors within an image. Instead of the millions of colors found in a full-color image, a color-reduced image utilizes a limited, specific set. This is a critical step in preparing a raster image for use as an embroidery digitizing template, where the number of available thread colors is restricted.
Studio includes a dedicated tool for color reduction, accessible via Main Menu > Image > Tools > Reduce Colors.
A raster image placed in the background of the Work Area typically serves as a template for digitizing. Preprocessing the image can significantly accelerate the digitizing process, particularly for complex designs with high color counts.
One effective approach is to convert the image from a full color scale to a limited palette. This provides a clear visualization of the final thread count and the layout of the stitches.
Original full-color raster image. At this stage, the user must determine the number and placement of thread colors.
Preprocessed image with a reduced color scale. In this example, the design can be digitized using seven thread colors (excluding the empty background).
The Color Reduction process utilizes a palette to determine the final color assigned to each pixel. The palette is displayed as a vertical column of color cells; the default configuration consists of black and white.
Custom palettes can be created using several methods. The first step is to define the number of colors using the control featuring a tube icon. This value can be adjusted at any time to increase or decrease the palette size.
Once the quantity is set, colors can be automatically generated from the image, manually mixed, or picked individually from the Work Area. These methods can be used in combination.
Click the Automatic button to generate the entire palette simultaneously. The software analyzes the image to select the most prominent colors. This serves as an excellent starting point, though manual adjustments are often required for optimal results.
Each color cell can be individually defined. Select a cell and click the Mixer button, or double-click (or long-tap) the cell to open the Color Mixer window.
To pick a color directly from the source, first select a palette cell to highlight it. Then, click the desired color within the image in the Work Area. The selected color will be copied into the highlighted cell.
Investing time in refining the palette ensures a cleaner color layout, making the digitizing of complex designs significantly easier.
Dithering replaces smooth color gradients with scattered pixels from the selected palette. The intensity of this effect is managed via the Dither control. When set to zero, no dithering is applied. Dithering is particularly useful when digitizing objects with color blending, as the dithered zones act as a guide for creating smooth stitch transitions.
Click the Preview button to review the results of the current palette configuration. The preview is displayed in a secondary area on the Main Control Panel, which supports zooming, scrolling, and panning.
Until the Preview button is clicked for the first time, the area displays a mask. This black-and-white image indicates which areas will be processed (black) and which will be excluded (white).
Pink palette applied exclusively to a masked area, leaving the remainder of the image unchanged.
You can process specific portions of an image rather than the entire file, which prevents unwanted color interleaving. Studio allows you to use fill vector objects as a mask. To convert only a specific area, draw a fill or column object over the image, select it, and then launch the Color Reduction tool. The conversion will apply only to the area beneath the selected objects.
For example, when digitizing a photo of a multi-colored animal, you can mask each color range individually. This allows you to apply a black/gray palette to one area and a brown palette to another without affecting the rest of the image.
Note: The Trace Tool can be used to easily create complex mask objects.
Note: For an alternative method of color simplification, refer to the Posterization Tool.