func (c *pixelsCommand) Exec(indexOffset int) error {
	p, err := c.img.image.Pixels()
	if err != nil {
		return err
	}
	c.result = p
	return nil
}
func (c *pixelsCommand) Exec(indexOffset int) error {
	p, err := c.img.image.Pixels()
	if err != nil {
		return err
	}
	c.result = p
	return nil
}
// Exec executes a pixelsCommand.