fix reported BPS for irregular values (#152)

Project.toml

@@ -1,7 +1,7 @@
 name = "TiffImages"
 uuid = "731e570b-9d59-4bfa-96dc-6df516fadf69"
 authors = ["Tamas Nagy <[email protected]>"]
-version = "0.9.0"
+version = "0.9.1"
 
 [deps]
 ColorTypes = "3da002f7-5984-5a60-b8a6-cbb66c0b333f"

src/types/common.jl

@@ -33,7 +33,8 @@ samplesperpixel(img::AbstractArray) = samplesperpixel(eltype(img))
 samplesperpixel(::Type{<: Colorant{T, N}}) where {T, N} = N
 
 bitspersample(img::AbstractArray) = bitspersample(eltype(img))
-bitspersample(::Type{<: Colorant{T, N}}) where {T, N} = sizeof(T)*8
+bitspersample(::Type{<: Colorant{T, N}}) where {T, N} = sizeof(T) * 8
+bitspersample(::Type{<: Colorant{<: FixedPoint{T, S}, N}}) where {T, S, N} = S
 
 sampleformat(img::AbstractArray) = sampleformat(eltype(img))
 sampleformat(::Type{<: Colorant{T, N}}) where {T <: AbstractFloat, N} = SAMPLEFORMAT_IEEEFP

test/runtests.jl

@@ -268,6 +268,8 @@ end
     m = sum(ref.data .- other.data) ./ length(ref)
     @test m.r < 0.001 && m.g < 0.001 && m.b < 0.001
 
+    @test other.ifds[1][TiffImages.BITSPERSAMPLE].data == UInt16[12,12,12]
+
     other = TiffImages.load(get_example("shapes_lzw_14bps.tif"))
     m = sum(ref.data .- other.data) ./ length(ref)
     @test m.r < 0.001 && m.g < 0.001 && m.b < 0.001