Peter Moretti
April 3rd, 2009, 02:30 AM
Does anyone know what type of effect/filter/method I can use to subtract one image from another?
By "subtract" I mean having the resulting image equal to a pixel by pixel representation of what chroma and luma would have to be added to the first image to get it to equal the second image.
I've seen this type of effect used for comparing compression techniques against an original image. If there's no visual difference, the resulting image is a uniform dark grey or black. If there is a visual difference, it shows as various squiggles representing detail that has been lost and artifacts that have been added.
Thanks much for any help :).
By "subtract" I mean having the resulting image equal to a pixel by pixel representation of what chroma and luma would have to be added to the first image to get it to equal the second image.
I've seen this type of effect used for comparing compression techniques against an original image. If there's no visual difference, the resulting image is a uniform dark grey or black. If there is a visual difference, it shows as various squiggles representing detail that has been lost and artifacts that have been added.
Thanks much for any help :).