With Image Analysis, it is possible to create RGB images from any type of data that originates from the image pixels. This kind of data can for instance be scores (T), the Original data or the residual X matrix, Xres. By dragging one of these matrices onto the Plot Area, the RGB image plot can be selected from the Plot Wizard.

Normally, the RGB image is a plot type comprised of three layers as shown below; red, green and blue. If the plotted matrix contains less than tree layers, the RGB image plot will only contain as many layers as the plotted matrix. In most cases the plotted data will not be actual RGB values. This means that Evince will rescale the actual values to fit the 8 bit (0-255) range of each color channel. The only matrix that is not rescaled is the Original data for imported RGB image files.

When the score matrix, T, is used for creating an RGB image this will result in a score image. A score image is a representation of the original image where the score values for each pixel is used instead of the RGB values. It can be convenient to analyze the score image in combination with a Scatter 2D score plot as shown below. Certain areas of the score image can be segmented by selecting certain observations in the scatter score plot.

RGB image settings:

Data range: The only available option is [MATRIX]. For the selected plot layer, this setting chooses what data layer should be used.

Color: Changes the color of the selected plot layer. The default setting is [AMPLITUDE] and should not be altered.

Comment: Changes the comment for the selected plot layer. Available options are [NONE]; no comment is used, [CUSTOM]; the user can enter a custom comment in the advanced settings, [CATEGORY]; the tooltip and text box will contain the observation category of the selected observations.

X-axis labels: Changes the labels of the X-axis. Available options are [NONE]; no labels are used, [INDEX]; the indices of the horizontal image pixels are used as labels, [VALUE]; the values of an image row are used for the labeling.

Y-axis labels: Changes the labels of the Y-axis. Available options are [NONE]; no labels are used, [INDEX]; the indices of the vertical image pixels are used as labels, [VALUE]; the values of an image row are used for the labeling.