✔ 最佳答案
我諗你講緊個 effect 係叫 halftone effect. 係 photoshop 到做。
最緊要係張張圖先轉為gray scale. 最好就 contrast 大啲。
之後再轉做 bitmap, 轉時佢會彈個 option window 比你,under "method" 到就可以揀 "halftone" 個 option.
禁咗 "OK" 之後就有得揀 "frequency" (frequency) 越大,你啲點點就會越大粒。under "shape" 就揀 "round"。然後禁“OK"就得喇。
如果要轉色,記住要轉返做 grayscale 再轉做 RGB 或 CMYK!
仲有咩唔明或想長細啲,可以用google 或 yahoo 啲 search engine search "halftone effect in photoshop"