Answered it myself. Changed to;
unsigned int myBuf[imageWidth * imageHeight * 4];
glReadPixels( 0, 0, imageWidth, imageHeight, GL_BGRA,
GL_UNSIGNED_INT_8_8_8_8, &myBuf);
return REALBuildPictureFromBuffer(imageWidth, imageHeight,
kRBPixelBGRX32, myBuf, imageWidth * 4);
…and things work much better. Amazing what a little googling can do.
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