* Skip empty frames when comparing layers.
* Grayscale DPX image files are no longer skewed.
* Fix integer overflow when scaling a 1-bit sample to Q64.
* Account for differences in image size when comparing two images.
* Set an upper ceiling compression with -quality and jpeg:extent.
OBS-URL: https://build.opensuse.org/package/show/graphics/ImageMagick?expand=0&rev=232
