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FAQ.How to compare two pictures?
Function ComparePictures(p as picture,q as picture) as Integer dim r,u as RGBSurface dim x,y,n,m,h,w as Integer dim w1,w2,h1,h2,d1,d2 as Integer dim c1,c2 as color h1=p.Height h2=q.Height w1=p.Width w2=q.Width d1=p.Depth d2=q.Depth if d1<>d2 then Return 1 elseif w1<>w2 then return 2 elseif h1<>h2 then Return 3 else r=p.RGBSurface u=q.RGBSurface if r=nil or u=nil then Return -1 else h=h1-1 w=w1-1 m=min(w,h) for n=0 to m c1=r.Pixel(n,n) c2=u.Pixel(n,n) if c1<>c2 then Return 4 end if next for y=0 to h for x=0 to w c1=r.Pixel(x,y) c2=u.Pixel(x,y) if c1<>c2 then Return 5 end if next next // 0 for equal // -1 for error (no RGBsurface) // 1 for different depth // 2 for different width // 3 for different height // 4 for different pixels (fast test) // 5 for different pixels (slow test) end if end if Exception Return -1End Function
Remember that this only works on bitmap pictures, so the picture.BitmapMBS function may be useful.