什么是Flash中位图的实际限制？

我可以从这篇文章最大的广场位闪存可以处理为4,095 x 4,095（这会导致16769025像素和BLA-BLA-BLA）。于是，他们说，如果我尝试去为4096 x 4096，我会失败。但我试图加载和显示位图图像尺寸4096 x 4096，和它的工作好。然后，我甚至试过图像尺寸5000倍5000，这是正常的了。我怎么不明白？什么是实际的限制以及如何计算呢？

As I can read it from this article the maximum square bitmap Flash can handle is 4,095 x 4,095 (which results in 16,769,025 pixels and bla-bla-bla). So, they say if I try to go to 4,096 x 4,096, I'll fail. But I have tried to load and display a bitmap image sized 4,096 x 4,096, and it worked well. Then, I even tried an image sized 5000 x 5000, and that was alright too. What do I not understand? What are the actual limits and how to calculate them?