用相片印表機印大頭照

我有一台 Canon CP900/910 的相片印表機，雖然是寫列印 4x6" 的照片規格，但是相紙規格是 10cm x 14.6 cm。且印大頭照時，2x2 inch 解析度 300 dpi 的規格，放到 4x6" 的 1800px * 1200px 時候圖片檔，印出來的 2 inch (5.08cm) 實際會被放大為 2.08 inch (5.2cm)。所以一開始做 2x2 照片時，大概就要選 1.95 inch * 1.95 inch 且 300 dpi 規格; 或是整張 4x6 照片解析度要設為 1843 pixel * 1228 pixel 的大小，印出來 2x2 照片規格比較正確。

I own a Canon CP900/910 photo printer. Although the spec is 4x6" photo printing, the actual paper size is 10cm x 14.6 cm。When printing passport photo, 2x2 inch and resolution 300 dpi put in the whole photo 4x6" picture 1800px * 1200 px file, the printed size of 2x2" (5.08cm) photo is actually 2.08 inch (5.2cm) on the photo paper. To compensate the difference, you have to rescale/resize the 2x2" to 1.95x195" with same resolution 300 dpi; or creating a new image with 1843 pixel * 1228 pixel for the whole photo file, so that the printed 2x2" photo will exactly match 2x2" on the ruler.