本帖最后由 3721 于 2013-5-10 16:00 编辑
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4K之争中的因素均衡与大环境（上）
4K之争中的因素均衡与大环境（中）
4K之争中的因素均衡与大环境（下）
本期问题导读：
3. ARRI会制造4K摄影机吗？ 4. 现在买4K摄影机就不是面向未来的投资吗？
3. ARRI会制造4K摄影机吗？
是的，我们正在开发下一代的摄影机，它们的分辨率也会比当今的ALEXA更高。但是，高分辨率并不是压倒一切的目标——我们希望将尽可能高的画质与真实世界中的实用能力结合起来——这也是在过去的三年中ALEXA如此成功的原因。若分辨率提高，那么这些因素仍然会保留它们原来的地位。当4K工作流程和发行渠道更为成熟时，高分辨率不会提高成本且影响画质时，我们也将会准备好一台摄影机，一台可以给我们的客户带来可靠的投资回报的摄影机。
4. 现在买4K摄影机就不是面向未来的投资吗？
如果您观察一下现在新款4K摄影机的发布速度，当4K真的到来时，似乎您现在购买的任何摄影机都会被更新更好的4K摄影机所取代。除此之外，ALEXA的画面已经是面向未来的设计，因为它的整体画质非常优秀，所提供给您的原始画面素材非常好，便于以此为基础做进一步加工。ALEXA画面可以输出为高清、2K，或上变换为4K分辨率，同时仍然能获得惊人的画质。例如，《007：大破天幕杀机》（Skyfall）和《爱》（Amour）都曾被上变换到4K并以4K DCP发行。《007：大破天幕杀机》还以IMAX 4K DCP格式来发行，画面由无压缩的2.8K ARRIRAW数字源母版（DSM）上变换而来。ALEXA画面在未来的4K显示器上将会非常出色。并且，未来的显示器并不只是具有更高的分辨率，还会有更高的对比度，因此也会利用到ALEXA优异的动态范围性能。更高的反差与更高的分辨率同样显而易见。
另外，ARRIRAW是一种开放的格式——它是无加密的。未来任何人都能够打开文件，并对画面进行处理，即使连ARRI都不复存在了，文件依然可以打开。其他厂商都会对文件的处理进行控制，从而掌控文件的历史存档。最重要的是，ARRIRAW是无压缩的，因此对特效制作或调色来说，没有任何压缩痕迹。我们的所有的新型ALEXA XT机型都具备XR模块（现有的ALEXA亦可通过升级获得），您可以拍摄并直接在机内录制无压缩的ARRIRAW文件，在4:3时速度可达90 fps，16:9时可达120 fps。
下期问题预告：
5. 在大银幕放映时，不需要4K画面吗？ 6. 4K不是更适合视觉特效工作吗？
BALANCE AND CONTEXT IN THE 4K DEBATE (II)
Today’s Questions:
3. Will ARRI make a 4K camera? 4. Isn’t buying a 4K camera now a future-proof investment?
3. Will ARRI make a 4K camera?
We are currently developing the next generation of cameras and yes, they will be of higher resolutions than today’s ALEXA. However, higher resolution is not the overriding goal – we aspire to the highest possible image quality combined with real-world practicality, which is what has made ALEXA such a success for the last three years. These priorities have to remain in place for higher resolutions to be of any use at all. When the market can better support 4K workflows and distribution, and when higher resolution does not come at the cost of lower image quality, we will be ready with a camera system – one that can provide a dependable return on investment for our customers.
4. Isn’t buying a 4K camera now a future-proof investment?
If you look at the speed with which 4K cameras are being introduced, it seems probable that any camera you can buy now will be replaced by newer and better 4K cameras when 4K is truly a reality. Besides this, ALEXA images already are future-proof, because the very high overall image quality gives you such good source material that you can do anything with it. ALEXA images can be output in HD, 2K or up-sampled to 4K with stunning results. For instance, Skyfall and Amour have been up-sampled to 4K and released as great-looking 4K DCPs, and Skyfall has also been released as a fantastic IMAX 4K DCP, up-scaled from the uncompressed 2.8K ARRIRAW Digital Source Master (DSM). ALEXA images will look superb on future 4K displays, but future displays won’t just have higher resolution, they will have higher contrast ratios, so ALEXA’s exceptional dynamic range will come into play as well, since increased contrast is perceived as increased resolution. In addition, ARRIRAW is an open format – it is unencrypted. Anyone can open the files and apply any kind of image processing at any time in the future, even if ARRI no longer exists. Other manufacturers are exerting more control over how their files can be handled, which imposes sanctions on how people archive for the future. Crucially, ARRIRAW is also uncompressed, so there are no compression artifacts for visual effects or color timing.With our new XR Module, which comes with all ALEXA XT cameras but is also available as an upgrade for existing ALEXAs, you can shoot uncompressed ARRIRAW in-camera at up to 90 fps for 4:3, or 120 fps for 16:9.
Next Questions:
5. Don’t you need 4K images for movies shown on the big screen? 6. Isn’t 4K best for visual effects work?
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发表于 2013-5-9 20:34
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