This should play if your Web browser has WebAssembly enabled (most do). Most examples will play unless they need to load files. The first time you click Play, Csound will spend a few seconds loading, then play. You can edit this code and replay it.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -n ;no sound output </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; ksmps = 32 0dbfs = 1 ; nchnls = 2 ; by Cesare Marilungo 2008 ; additions by Menno Knevel 2021 ; image opcodes need a black canvas- black = no sound! giimage1 imageload "imageOpcode01.png" ; load this image giimagew, giimageh imagesize giimage1 ; get dimensions of imageOpcode01.png giimageNEW imagecreate giimagew,giimageh ; and use those same dimensions for the new image instr 1 ; copies imageOpcode01.png and changes it kndx = 0 kx linseg 0, p3, 1 prints "\nwidth = %d pixels, heigth = %d pixels\n\n", giimagew, giimageh myloop: ky = kndx/(giimageh) ; y-axis krd, kgn, kbl imagegetpixel giimage1, kx, ky ; get pixels from 'old' image imagesetpixel giimageNEW, kx*.9, ky*.5, krd, kgn, kbl; redesign the image loop_lt kndx, 0.5, giimageh, myloop endin instr 2 imagesave giimageNEW, "imageOUT.png" ; save this new image endin instr 3 imagefree giimage1 ; unload images imagefree giimageNEW endin </CsInstruments> <CsScore> i1 1 1 i2 2 1 i3 3 .1 e </CsScore> </CsoundSynthesizer>