Processing your sketch

Elongated stars, stray markings, and uneven blending — sound familiar? After all, we frequently sketch in damp or cold conditions under dim lighting, often with stiff fingers — then throw fatigue into the mix.

So, this month I want to talk about cleaning up scanned sketches with simple photo-editing tools. I’ll use the interacting spiral galaxies called the Antennae (NGC 4038/9) to demonstrate how.

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