In order to use a limit of 255, I needed to use GL_UNSIGNED_BYTE (char)
Code:
int height=100;
int width=100;
int length=100;
const long size = width*height*length*3;
unsigned char* data = (unsigned char*)calloc(size,sizeof(unsigned
char));
for(long i=0; i < size ; i+= 3)
{
data[i] = 255; //red
data[i+1] = 0; //green
data[i+2] = 0; //blue
}
osg::ref_ptr<osg::Image> image = new osg::Image;
image->allocateImage(width, height, length, GL_RGB, GL_UNSIGNED_BYTE);
image->setOrigin(osg::Image::BOTTOM_LEFT);//start countingpixels on the
Bottom left of the picture
image->setImage(width, height, length , GL_RGB, GL_RGB,
GL_UNSIGNED_BYTE,data, osg::Image::NO_DELETE);
osgDB::writeImageFile(*image, "test.jpg");
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=21589#21589
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