Flattening for PDF/X-1a, PDF/X-3, PDF 1.3 and EPS rasterized a picture,
gradient, pattern, mesh or raster effect over its whole frame when a
clipping mask cropped it. The hidden part came out as opaque white and
covered the art under it, on the same page and on the next one.
- Flattening rasterizes clipped art only where its clipping path shows
it, nested clip groups included.
- Art in a clipping layer is flattened as the layer's clipping path
shows it. A flattened group that also holds art from outside the
layer takes the place of that art, so the layer's clipping path no
longer cuts it.
Documents in which no clip group hides flattened art, and no clipping
layer holds it, export the same bytes as before.
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