Grayscale image: Difference between revisions
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{{task|Image processing}}[[Category:Raster graphics operations]]
Many image processing algorithms are defined for [[wp:Grayscale|grayscale]] (or else monochromatic) images.
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There is a test program, which can be compiled and run as follows:
<pre>$ patscc -std=gnu2x -g -O2 -DATS_MEMALLOC_LIBC -DATS BITMAP_GRAYSCALE_TASK_TEST bitmap{,
$ ./a.out</pre>
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animage = gray
call output_ppm(an_unit, animage)</syntaxhighlight>
=={{header|Fōrmulæ}}==▼
=={{header|FreeBASIC}}==
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{{output}}
[[File:Color to Grayscale.png]]
▲=={{header|Fōrmulæ}}==
{{FormulaeEntry|page=https://formulae.org/?script=examples/Grayscale_image}}
'''Solution'''
Note the use of the dot product in the calculation of the gray level.
[[File:Fōrmulæ - Grayscale image 01.png]]
'''Test case'''
[[File:Fōrmulæ - Grayscale image 02.png]]
[[File:Fōrmulæ - Grayscale image 03.png]]
=={{header|Go}}==
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<syntaxhighlight lang="matlab">function [grayImage] = colortograyscale(inputImage)
grayImage = rgb2gray(inputImage);</syntaxhighlight>
=={{header|MiniScript}}==
This GUI implementation is for use with [http://miniscript.org/MiniMicro Mini Micro].
<syntaxhighlight lang="miniscript">
greyedColor = function(colr)
clist = color.toList(colr)
lum = [0.2126, 0.7152, 0.0722]
red = clist[0] * lum[0]
green = clist[1] * lum[1]
blue = clist[2] * lum[2]
grey = red + green + blue
return color.fromList([grey, grey, grey, clist[3]])
end function
toGreyScale = function(img)
greyImg = Image.create(img.width, img.height)
for x in range(0, img.width - 1)
for y in range(0, img.height - 1)
greyed = greyedColor(img.pixel(x, y))
greyImg.setPixel x, y, greyed
end for
end for
return greyImg
end function
clear
// The turtle and color wheel images are included with MiniMicro
turtle = file.loadImage("/sys/pics/animals/turtle.png")
greyTurtle = toGreyScale(turtle)
gfx.drawImage turtle, 0, 0
gfx.drawImage greyTurtle, turtle.width, 0
colorWheel = file.loadImage("/sys/pics/ColorWheel.png")
greyWheel = toGreyScale(colorWheel)
gfx.drawImage colorWheel, 0, 320
gfx.drawImage greyWheel, greyWheel.width, 320
</syntaxhighlight>
=={{header|Nim}}==
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{{libheader|DOME}}
This script converts the image [https://rosettacode.org/File:Lenna100.jpg Lenna100.jpg] to grayscale and then displays the two images side by side.
<syntaxhighlight lang="
import "dome" for Window
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