I am using a program that requires a .tiff input with 8 bits (grayscale) and the 1 sample per pixel characteristic. I scale the layer down in GIMP, keep the canvas the same size, choose grayscale, and turn off the alpha channel. Only 1 layer exists. However, when I export the image, the size is twice the original image, has two samples per pixel, and says that there is an alpha channel. The following is output from the sips command on OS X.
pixelWidth: 3296 pixelHeight: 2472 typeIdentifier: public.tiff format: tiff formatOptions: default dpiWidth: 72.000 dpiHeight: 72.000 samplesPerPixel: 2 bitsPerSample: 8 hasAlpha: yes space: Gray
My main guess is the alpha channel is saving when the layer is smaller than the canvas, even though the alpha channel is turned off for the layer. Any ideas why this is happening? Appreciate any answers.