I receive a failure message from Rapid Inspector that says Alpha Planes (alpha channels). What are alpha channels and what can I do to fix this?

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I receive a failure message from Rapid Inspector that says Alpha Planes (alpha channels). What are alpha channels and what can I do to fix this?

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Rapid Inspector will report a ALPHA_PLANES error when it finds an image with extra color (or channel) information. This error is inherent to an image that contains more color channels (or planes) than needed. Please visit this link to see how to remove alpha channels in Adobe Photoshop. • The Cadmus Digital Art web site states that combination halftones should be 600 DPI, but I inspected a 300 DPI combination halftone in TIFF format and it PASSED Rapid Inspector … why? The TIFF file format, in addition to color modes, has a MINIMUM resolution requirement of 300 DPI. From a software program (Rapid Inspector) point of view, combination halftones in the TIFF format have very simple attributes: a number of pixels per inch, a color mode, and a size in height and width. Rapid Inspector cannot tell that a user has combined line art with a halftone. So, Rapid Inspector will pass any TIFF images higher than the MINIMUM required resolution. Please note the resolutions above are the Cadmus reco

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