Cameras and Tests. The three webcams I compared were the embedded webcam on my HP EliteBook 8760w; the Logitech HD Webcam C615, an external unit you can buy for under $40; and the Logitech Broadcaster, an external unit that costs around $200 (Figure 1, below).
Special cake flour with a high starch-to-gluten ratio is made from fine-textured, soft, low-protein wheat. It is strongly bleached, and compared to all-purpose flour, cake flour tends to result in cakes with a lighter, less dense texture.
All-purpose flour is made from a blend of high-and low-gluten wheats, and has a bit less protein than bread flour  11% or 12% vs. 13% or 14%. You can always substitute all-purpose flour for bread flour, although your results may not be as glorious as you had hoped.