hello,
this pdf file created with Adobe InDesign, alot of elements are missing, also wrong color are displaying:
http://tal-ram.co.il/images/products/orders/14265798291.pdf

![viewer](https://cloud.githubusercontent.com/assets/1198143/6713275/f88ae242-cd99-11e4-8202-fdb5dc4b132e.png)

![org](https://cloud.githubusercontent.com/assets/1198143/6713312/24d83ff2-cd9a-11e4-82e7-647ad5440a64.png)

if (!this.contentVisible) {
      return;
    }
    this.groupLevel--;
    const groupCtx = this.ctx;
    this.ctx = this.groupStack.pop();
    
    
    this.ctx.imageSmoothingEnabled = false;
    if (group.smask) {
      this.tempSMask = this.smaskStack.pop();
    } else {
      this.ctx.drawImage(groupCtx.canvas, 0, 0);
    }
    this.restore();
  }
  beginAnnotations() {