Preserving channels in exported images Canvas image channels are compatible with the alpha channels used in other image-editing programs, including Adobe Photoshop. How- ever, you must use the correct procedure to preserve alpha channels when you export an image into Photoshop format. If you want to export an image into Photoshop format and preserve the image’s alpha channels, be sure to use the Export command in the Image menu, rather than the Save As command. If you use the Save As command and choose Photoshop format, the resulting file will not contain the alpha channels associated with the image. To export an image with alpha channels 1 Select the paint object in the Canvas document. 2 Choose Image > Export > Photoshop. A directory dialog box appears. 3 Specify a location to save the file, type a file name, and click Save to export the selected image as a Photoshop file. Understanding image channels Canvas uses up to 24 channels to store the digital information that makes up the image in a paint object. There are three types of channels: color or image channels, alpha channels, and channel masks. All images have at least one channel. An image can also contain one or more alpha channels and a single channel mask, if you create them. The Channels palette displays the channels of an image. Whenever an image is in edit mode, you can use the Channels palette to select Add to Selection Preserves the current selection and selects additional pixels based on the channel Subtract from Selection Removes pixels from the current selection based on the channel Intersect with Selection Creates a new selection composed of pix- els that appear in both the current selec- tion and the channel you are loading Option Result
Canvas 8 Help: Selections and channels (18 of 32)                                                   Page #668