The 1.1 version of Channel Mapper for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The following version: 1.1 is the most frequently downloaded one by the program users.
Channel Mapper for Mac is categorized as Design & Photo Tools. You can set up Channel Mapper on Mac OS X 10.7 or later. The application is sometimes referred to as "ChannelMapper". Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free Mac application is an intellectual property of Simon Fortelny.
From the developer:
Use Channel Mapper to create a new image from the red, green, blue, alpha, grayscale channels of a source image.
When creating the new image you can choose which source channel is mapped destination channel.
So you can use the source images red channel as the blue channel in the new image.
You can also use it to create an image with only on of the sources channels; for example an image only containing the sources alpha channel.
You may want to check out more software for Mac, such as Tangent Mapper, Function Keys Mapper or XML SIte Mapper, which might be similar to Channel Mapper.