I had the same issue when using imagecopyresampled() to resize PNG images with transparent background. It introduced subtle noise to the transparent background in the resulting image. It looks like some kind of rounding issue within the resampling algorithm.
As a temporary workaround, reverting libgd back to 2.1.1-4build2 resolves the problem.
I had the same issue when using imagecopyresamp led() to resize PNG images with transparent background. It introduced subtle noise to the transparent background in the resulting image. It looks like some kind of rounding issue within the resampling algorithm.
As a temporary workaround, reverting libgd back to 2.1.1-4build2 resolves the problem.