imagecreate
imagecreate — Create an empty image of a given size.
Description
Plugin opcode in image. This opcode is part of the plugin repository and has to be installed separately. The plugin repository can be found here: https://github.com/csound/plugins
Create an empty image of a given size. Individual pixel values can then be set with imagesetpixel.
Initialization
iimagenum -- number assigned to the created image.
iwidth -- desired image width.
iheight -- desired image height.
Examples
Here is an example of the imagecreate opcode. It uses the file imageopcodes.csd and imageOpcode01.png.
Example 462. Example of the imagecreate opcode.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -n ;no sound output </CsOptions> <CsInstruments> 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>
This is what the image imageOpcode01.png looks like:
and this is what the created image imageOUT.png looks like:
