Bitmap/Read a PPM file: Difference between revisions
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=={{header|Julia}}== |
=={{header|Julia}}== |
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{{works with|Julia|0.6}} |
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using Color, Images, FixedPointNumbers |
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<lang julia>using Images, FileIO, Netpbm |
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const M_RGB_Y = reshape(Color.M_RGB_XYZ[2,:], 3) |
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rgbimg = load("data/bitmapInputTest.ppm") |
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function rgb2gray(img::Image) |
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greyimg = Gray.(rgbimg) |
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g = red(img)*M_RGB_Y[1] + green(img)*M_RGB_Y[2] + blue(img)*M_RGB_Y[3] |
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save("data/bitmapOutputTest.ppm", greyimg)</lang> |
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g = clamp(g, 0.0, 1.0) |
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return grayim(g) |
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end |
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ima = imread("bitmap_read_ppm_in.ppm") |
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imb = convert(Image{Gray{Ufixed8}}, ima) |
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imwrite(imb, "bitmap_read_ppm_out.png") |
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</lang> |
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{{out}} |
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[https://raw.githubusercontent.com/MichaeLeroy/rosetta-code/master/julia/support/color_chips.png Input] and [https://raw.githubusercontent.com/MichaeLeroy/rosetta-code/master/julia/completed/bitmap_read_ppm_out.png output] images in <tt>PNG</tt> format. The <tt>PPM</tt> input file was created using a variant of the Julia PPM/Write [https://github.com/MichaeLeroy/rosetta-code/blob/master/julia/support/color_chips.jl solution] to provide something reasonably colorful. |
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=={{header|Mathematica}}/ {{header|Wolfram Language}}== |
=={{header|Mathematica}}/ {{header|Wolfram Language}}== |
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