Complete Blackout: Not a Single Ray of Light Enters

A blackout setup that achieves complete darkness. The curtains are double-layered: an inner sheer layer and an outer full-blackout thick fabric. The key is in the details—the curtains are significantly wider than the window, extending thirty centimeters beyond on each side to meet the wall. The top track is hidden in a ceiling recess, with both ends of the recess sealed. The bottom hem extends a few centimeters past the floor, ensuring no light leaks from any of the four sides. The image should show the daytime state with everything closed: the room is almost completely dark, with only a very faint halo of light at the edges of the sheer curtain, and the bed and furniture are reduced to silhouettes. A corner of the image should show a comparison with a poorly executed version: clear lines of light leaking from the top and sides of the curtains.
Avoid: making both versions similar, using roller blinds and Venetian blinds that cause light leakage on all four sides, exposing the track, making the curtain width only equal to the window width.

Translated from Chinese by AI.

一組做到全暗的遮光配置。窗簾是雙層的:內層是薄紗,外層是全遮光的厚布;關鍵在細節——窗簾的寬度遠超過窗寬並在兩側各多出三十公分貼牆,上方的軌道藏在天花凹槽內且凹槽兩端封閉,下擺長過地面幾公分,因此四邊都沒有漏光的縫。畫面呈現白天全部關上的狀態:房間幾乎全黑,只有紗簾邊緣有一點極弱的光暈,床與家具只剩輪廓。畫面一角以做不到的版本作對照:窗簾上緣與兩側有明顯的漏光線條。避免:讓兩者相似、使用捲簾與百葉造成四邊漏光、把軌道外露、讓窗簾的寬度只等於窗寬。