Channel Mapper at Mac App Store analyse

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.