By save("xxx.gif", bitmat), one should get a white picture, however, the output is black.
using FileIO
save("one.gif", ones(Bool, 200, 200)) # get a black image
load("one.gif") |> iszero # true
More generally, when the rate of zeros is small enough, the ones-matrix is treated as a zeros-matrix.
a = ones(Bool, 200, 200)
# set zero on a small range
ind = rand(1:40000, 300)
a[ind] .= false
save("small.gif", a)
load("small.gif") |> iszero # true again
# set zero on more place
ind = rand(1:40000, 3000)
a[ind] .= false
save("normal.gif", a) # now we get the right image
This issue occurs only in the case of gif, might have to do with the wrapper of ImageMagick.jl?
By
save("xxx.gif", bitmat), one should get a white picture, however, the output is black.More generally, when the rate of zeros is small enough, the ones-matrix is treated as a zeros-matrix.
This issue occurs only in the case of
gif, might have to do with the wrapper of ImageMagick.jl?