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Peter Werner posted a topic in (Pre 1.7) Bugs on MacAffinity Photo 1.3.4 (App Store build). I was experimenting with creating a simple high pass effect: Open image Place an Invert adjustment on top Set the blend mode of the Invert Adjustment Layer to Linear Light and Alpha to 50%. As expected, everything is 50% gray. At this point, lowpass filtering the top layer in any way (blurring, median etc.) should theoretically produce a high pass filter effect (it works fine when doing this with a duplicate of the base layer). I tried to do it using only the Adjustment Layer and no duplicate of the base layer. My first attempt was the blur option in the layer styles. With or without "Preserve Alpha" on, this did not have any effect whatsoever. I then created a Gaussian Blur filter layer and nested it inside the Invert Adjustment Layer. With "Preserve Alpha" on, this does not have any effect either. With "Preserve Alpha" on, however, this leads to the edges of the tiles of the memory manager becoming softened (i.e. each tile's alpha gets blurred individually). The image itself is not being blurred at all. See attached Screenshot. I'm not sure which parts of this are by design and which parts are bugs. Should applying blur to an Adjustment Layer, either as a Layer Style or as a nested filter layer, theoretically lead to the adjustment being applied to a copy of the original image, then blurred, and then blended with the original? That's what I would intuitively have expected to happen. If not, maybe the Blur layer style should be disabled for Adjustment layers and Adjustment Layers should not allow Filter Layers to be nested inside of them, because it's kind of confusing if they have no effect.