Grayscale image: Difference between revisions
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(→{{header|PureBasic}}: Corrected code to include ImageToColor() function) |
m (→{{header|REXX}}: changed/added comments and whitespace, changed indentations, optimized/simplified the code for calculations.) |
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=={{header|REXX}}== |
=={{header|REXX}}== |
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<lang rexx>/*REXX program |
<lang rexx>/*REXX program converts a RGB (red─green─blue) image to a grayscale image. */ |
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blue='00 00 ff'x |
blue= '00 00 ff'x /*define the blue color (hexadecimal).*/ |
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@.= blue /*set the entire image to blue color.*/ |
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width= 60 /* width of the |
width= 60 /* width of the image (in pixels). */ |
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height=100 /*height " " " */ |
height= 100 /*height " " " " " */ |
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do |
do col=1 for width |
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do |
do row=1 for height /* [↓] C2D convert char ───> decimal*/ |
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r= left( |
r= left(@.col.row, 1) ; r=c2d(r) /*extract the component red & convert.*/ |
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g=substr( |
g=substr(@.col.row, 2, 1) ; g=c2d(g) /* " " " green " " */ |
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b= right( |
b= right(@.col.row, 1) ; b=c2d(b) /* " " " blue " " */ |
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@.col.row=d2c((.2126*r+.7152*g +.0722*b)%1) /*convert RGB number ───► grayscale. */ |
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end /*row*/ /* [↑] D2C convert decimal ───> char*/ |
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end /*j*/ |
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/*stick a fork in it, we're all done. */</lang> |
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end /*k*/ |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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