Bitmap/Histogram: Difference between revisions
Content added Content deleted
(Added Kotlin) |
(Added Julia language) |
||
Line 723: | Line 723: | ||
=={{header|Julia}}== |
=={{header|Julia}}== |
||
{{works with|Julia|0.6}} |
|||
using Color, Images, FixedPointNumbers |
|||
ima = imread("bitmap_histogram_in.jpg") |
|||
imb = convert(Image{Gray{Ufixed8}}, ima) |
|||
<lang julia>using Images, FileIO |
|||
# calculate histogram |
|||
a = map(x->x.val.i, imb.data) |
|||
(nothing, h) = hist(reshape(a, length(a)), -1:typemax(Uint8)) |
|||
ima = load("data/lenna50.jpg") |
|||
imb = Gray.(ima) |
|||
fill!(imb, Gray(0.0)) |
|||
⚫ | |||
medcol = median(imb) |
|||
imwrite(imb, "bitmap_histogram_out.png") |
|||
imb[imb .≤ medcol] = Gray(0.0) |
|||
</lang> |
|||
⚫ | |||
This solution calculates the histogram, <tt>h</tt>, to comply with the letter of the task description. However, because it is easiest to calculate the median luminosity directly, <tt>h</tt> is not used to calculate the black to white threshold used to create the output image. |
|||
save("data/lennaGray.jpg", imb)</lang> |
|||
{{out}} |
|||
The [https://raw.githubusercontent.com/MichaeLeroy/rosetta-code/master/julia/completed/bitmap_histogram_in.jpg input] and [https://raw.githubusercontent.com/MichaeLeroy/rosetta-code/master/julia/completed/bitmap_histogram_out.png output] files. |
|||
=={{header|Kotlin}}== |
=={{header|Kotlin}}== |