Changing image modes The Mode submenu lets you change the mode of selected paint objects. You might want to change modes so you can use certain features, or to reduce memory requirements. For example, you might want to convert an Indexed image to RGB Color mode to apply image filters. You might want to convert an RGB Color image to Grayscale mode to save memory when a document is printed without color. To change image modes:  Select one or more paint objects. Or, with a paint object in edit mode, choose the mode you want in the Image > Mode submenu. Some modes are available only if the object’s current mode is com- patible. For example, Black & White mode and Duotone mode are available only when Grayscale paint objects are selected. If the mode you choose does not support an image’s full color range, a message asks you to confirm the change. Click OK to proceed. If you choose Duotone mode or Indexed mode, you can select options in a dialog box and then click OK to complete the conver- sion. See “Duotone image mode” on page 31.629 and “Indexed image mode” on page 31.623. Black & White image mode Black & White image mode is used for scanned line art and black- and-white (“bitmap”) images, which contain only black and white pixels. Black & White mode images require the least amount of memory and disk space. To convert to Black & White mode Grayscale mode images and Multichannel mode images are the only images you can convert to Black & White mode. If an image is not Grayscale, convert it to Grayscale mode first if you want to convert it to Black & White mode. 1 Select the paint objects to convert and choose Image > Mode > Black & White. The Select Halftone Method dialog box lets you choose a conversion option. 2 Select Pattern Dither, Diffusion Dither, or Threshold, and then click OK. Tip Many images from the Web are indexed. These images must be converted to RGB before you can start editing them.
Canvas 8 Help: Painting and image-editing (36 of 46)                                                Page #622