Raster image fragment histogram |
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The mode allows to change the used palette color interval for the purpose of improvement the raster map visualization quality. It is recommended to apply this mode to rasters with 256 grey gradation at processing the results the air photographic survey and the space photographic survey. At activization the mode it is necessary to choose the raster image area formed by grey gradation. The fragment choice is carried out by the indication (instruction) of two points – the opposite rectangular tops. Histogram dialogue including the histogram image for the rasters appeared in chosen fragment will be actuated after processing the chosen raster image fragment. Histogram dialogue description. The processable raster name is selected from a drop-down raster list in the top dialogue part. The change of the working interval borders is carried out at the moving extreme pointers. The raster image brightness is varies at the moving average pointer. Auto button installs an optimum working interval. Reset button restores in the initial state: - brightness and contrast raster palette values; - graphic raster palette (the palette is loaded from the raster file, instead of from a service file).
At switched on For all rasters mode Auto and Reset buttons are actual for all rasters. The redrawing the window contents in view of brought changes is carried out at switched on Redraw mode at change the working interval, at the switched off mode, changes of a working interval are installed by pressing Apply button. OK button installs all brought changes and closes the dialogue. Cancel button cancels all brought changes and closes the dialogue. Activization Raster image fragment histogram mode: - to open Work with raster panel by pressing the so name button on the Raster Editor panel; - to choose Histogram of the raster map fragment button.
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The mode is intended for construction and display the histogram of the chosen raster image fragment. The histogram represents graphic display the repetition number of each raster palette color on the document window (in the selected area).