Autodesk 05720-017408-9641 User Guide - Page 69

6 Color Correction and Color Filtration The color filtration and color correction tools can be used to prepare an image for further, more complicated operations, such as binarization, layering, raster editing and vectorization. The color filters are also used for image enhancement after operations that move image objects or change the resolution, such as scaling, aligning, rotation, calibration or four-point correction. In this chapter the following color correction procedures and color image filtration procedures are described: · Conversion to RGB · Correction using a histogram - redistribution of image brightness and contrast values · Modifying brightness, contrast, hue and saturation · Blur · Unsharp Mask · Median Conversion to RGB, grayscale and 8-bit indexed Every image in WiseImage can be converted to grayscale, RGB (24 bits per color) and 8-bit indexed image. Conversion operations can be applied to several images of an appropriate type at once. So, if several images are inserted in the current drawing and they are available (visible, allocated on unlocked layers), you should select a group of raster images before running this operation. By converting monochrome images to grayscale or RGB you make possible to apply color filters to the image (Blur, Unsharp, Median). Conversion of a color image to 8-bit indexed is the tool facilitating color management. Þ This operation is not applicable for images with clipping boundary. To convert an image to RGB Select images to be processed on the screen. Choose Convert to 24 Bits from the rImage menu, - or - Start the operation without choosing an image. Select an image you want to process from the dialog box. To convert an image to Grayscale Select images to be processed on the screen. Choose Convert to Grayscale from the rImage menu,