test=ImageData[Rasterize["50",RasterSize->50,ImageSize->200]]
data=ParallelTable[{i,j,If[Mean@test[[i,j]]>0.95,0,1]},
{i,Dimensions[test][[1]]},{j,Dimensions[test][[2]]}]
picdata=Table[ParallelMap[If[#[[-1]]==0,"",
ImageResize[Import[RandomChoice[FileNames["*.jpeg",
"/Users/chungyuandye/Pictures/照片圖庫V4.photoslibrary/originals/",Infinity]]],{100,100}]]&,
data[[i]]],{i,54}]
GraphicsGrid[picdata]
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