Reveal the layer that has a darker sky, then go to Layer>Mask>Hide All. Grab the Brush tool, set colour to white and brush opacity 50%, then paint over the sky to gradually reveal the darker ...

Metal ECOs play a vital role in absorbing such last minute design changes before tapeout and hence help save millions in terms of mask cost. They also help avoid all layer mask change in re-spins to ...

Doubling up this way may offer extra protection if, for example, you're using two single-layer cotton masks, ideally with a high thread count (around 600). That way you can mimic a mask that has ...