imagegetpixel — Return the RGB pixel values of a previously opened or created image.
Return the RGB pixel values of a previously opened or created image. An image can be loaded with imageload. An empty image can be created with imagecreate.
ared, agreen, ablue imagegetpixel iimagenum, ax, ay
kred, kgreen, kblue imagegetpixel iimagenum, kx, ky
iimagenum -- the reference of the image.. It should be a value returned by imageload or imagecreate.
ax (kx) -- horizontal pixel position (must be a float from 0 to 1).
ay (ky) -- vertical pixel position (must be a float from 0 to 1).
ared (kred) -- red value of the pixel (mapped to a float from 0 to 1).
agreen (kgreen) -- green value of the pixel (mapped to a float from 0 to 1).
ablue (kblue) -- blue value of the pixel (mapped to a float from 0 to 1).
Here is an example of the imagegetpixel opcode. It uses the files imageopcodesdemo2.csd test1.png and test2.png.
Example 388. Example of the imagegetpixel opcode.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform ; Audio out Audio in -odac -iadc ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o imageopcodesdemo2.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 48000 ksmps = 100 nchnls = 2 ;By Cesare Marilungo 2008 zakinit 10,1 ;Load the image - should be 512x512 pixels giimage imageload "test1.png" ;giimage imageload "test2.png" ;--try this too giimagew, giimageh imagesize giimage giwave ftgen 1, 0, 1024, 10, 1 gifrqs ftgen 2,0,512,-5, 1,512,10 giamps ftgen 3, 0, 512, 10, 1 instr 100 kindex = 0 icnt = giimageh kx_ linseg 0, p3, 1 kenv linseg 0, .2, 500, p3 - .4, 500, .2, 0 ; Read a column of pixels and store the red values ; inside the table 'giamps' loop: ky_ = kindex/giimageh ;Get the pixel color values at kx_, ky_ kred, kgreen, kblue imagegetpixel giimage, kx_, ky_ ;Write the red values inside the table 'giamps' tablew kred, kindex, giamps kindex = kindex+1 if (kindex < icnt) kgoto loop ; Use an oscillator bank (additive synthesis) to generate sound ; setting amplitudes for each partial according to the image asig adsynt kenv, 220, giwave, gifrqs, giamps, icnt, 2 outs asig, asig endin instr 101 ; Free memory used by the image imagefree giimage endin </CsInstruments> <CsScore> t 0 60 i100 1 20 i101 21 1 e </CsScore> </CsoundSynthesizer>